Second seed Daniil Medvedev refuses to start thinking about a US Open final against Novak Djokovic despite reaching his third straight semi-final at Flushing Meadows on Tuesday.

Medvedev dropped a set for the first time at this year's US Open but still got through, winning 6-3 6-0 4-6 7-5 over Dutch qualifier Botic van de Zandschulp on Tuesday.

The 25-year-old will play the winner of the quarter-final between Canadian 12th seed Felix Auger-Aliassime and Spanish teenager Carlos Alcaraz in the last four.

Top seed Djokovic, who has won all three majors this year, looms on the other side of the draw, with a quarter-final match-up on Wednesday against sixth seed Matteo Berrettini, while fourth seed Alexander Zverev is still alive.

"I don't think about him [Djokovic], because as we saw, anybody can beat anybody," Medvedev said at his post-match news conference.

"If he's in the final, and if I'm there, I'm happy. He plays on the days where I don't play so I watch his matches just because I enjoy watching tennis.

"I'm not going to root or cheer for somebody. I'm just gonna enjoy the tennis and then prepare for the winner. It's same every match."

Medvedev's victory clinches his spot in the final four at Flushing Meadows for the third straight year, having lost the 2019 final to Rafael Nadal.

"[I'm] really happy to be in the semis again, third time in a row," Medvedev said. "I couldn't dream of it four years ago, but now it's three."

Medvedev will be several years older than his next opponent, with Auger-Aliassime turning 21 last month and Alcaraz is still only 18.

Neither has ever reached a major semi-final either, while Medvedev will be playing in his fourth, having won two of them previously including at this year's Australian Open.

"I always said that experience helps me," Medvedev said. "You never know, because you're gonna play tough opponents, semis or final.

"Who knows? Maybe Novak. But first of course Felix or Carlos. Whoever wins gonna be on huge fire. You know they are much younger than even me.

"But for them it's going to be a first semis of a slam. Experience is not everything, because, for example, when I was in my first semis of a slam, I won it. Doesn't mean if you're there for the first time you're gonna lose it. But I like that I have this experience."

Daniil Medvedev took the first spot in the men's semi-finals at the US Open as he beat qualifier Botic van de Zandschulp in four sets on Tuesday.

Second seed Medvedev was two sets up with just over an hour played at Arthur Ashe Stadium, yet was ultimately made to work for a 6-3 6-0 4-6 7-5 triumph.

The Russian, a beaten finalist at Flushing Meadows in 2019 and a semi-finalist last year, broke Van de Zandschulp three times in the opening set, which he took at the fourth time of asking as his Dutch opponent offered up the first sign it would not be an easy day for the favourite.

Medvedev wrapped up a second set bagel with ease, though Van de Zandschulp – who beat in-form world number 11 Casper Ruud en route to the quarters – found some resolve in the third.

Unforced errors from the world number two handed Van de Zandschulp hope and the 25-year-old stuck 91 per cent of his first-serve points to take advantage.

Medvedev's wobble was short lived, however, with his composure regaining as he held his serve in what proved to be the final set.

A match point went begging as Medvedev missed the chance to break, but victory was assured on Van de Zandschulp's next serve, with a drop shot nestling into the net.

Next up for Medvedev is Felix Auger-Aliassime or Carlos Alcaraz, with the latter the youngest men's quarter-finalist at the US Open in the Open Era.

Data Slam: Medvedev's serve too strong

Medvedev won a whopping 83 per cent of his first serve points, converting 54 of 65, and finished with 13 aces. "I'm really happy with my serve in the fourth set, and to get through without a tie-break," he said. Indeed, in the final set, the 25-year-old's first serve percentage was up at 85. 

WINNERS/UNFORCED ERRORS

Van de Zandschulp – 36/35
Medvedev – 36/24

ACES/DOUBLE FAULTS

Van de Zandschulp – 4/4
Medvedev – 13/1

BREAK POINTS WON

Van de Zandschulp – 2/5
Medvedev – 7/12

Jenson Brooksby has confidence he can compete with anybody after threatening a fourth-round upset against Novak Djokovic at the US Open.

The unheralded American posed a real problem for Djokovic at Arthur Ashe Stadium and took out the opening set 6-1 in New York City.

It was not to be, though, as Djokovic – chasing a calendar Grand Slam – roared back to win 1-6 6-3 6-2 6-2.

Despite falling short, Brooksby is only looking at the positives from going toe-to-toe with the world number one in such a huge match.

"It's definitely all positive things to take away. I learned my game. I'm feeling really confident in my game. I believe I can compete with anybody," Brooksby said after his first run to the second week of a grand slam.

"I knew it would be important to start strong, to impose my mindset and my strategy, my game out there. It's definitely special. I mean, I always enjoy the matches and everything throughout the moment. Obviously you have to stay focused.

"Afterwards, you can always have time to reflect more. Just appreciate and enjoy for the whole journey.

"Atmospheres like that are what you want to be in front of since you were a little kid, watching on TV when you were young, and now you're living it. It is something I really appreciate and I'm grateful to be here now. I'm excited to keep [playing] in atmospheres like this for the future."

Brooksby required treatment a couple of times during the match and revealed he was contending with an issue to his left hip.

"Yeah, there was something. Something that kind of came up from later in the second match, then in the third one. Even with a day off, then kind of into today, like my left hip kind of was bothering me even early on and more into it," he added.

"Not like it's an excuse or anything, but it kind of went throughout the leg today a bit. I was struggling more to push off and move. But that's part of the sport. I did everything I could to feel the best I can going out there today and all the other days. There's no regrets on that.

"I definitely think if there wasn't that, I could have kept a better level up closer to the first set throughout the rest of the match."

Brooksby only reached the world's top 100 earlier this month and is now projected to be on the cusp of the top 40.

The 20-year-old relished his first experience of playing on Arthur Ashe.

"I did take time to look around a little bit, just appreciated being in an atmosphere like that with so many people cheering you on. Took a moment to still have it all in after," he said. 

"You're not going to win every match you play obviously, but you still have to enjoy it.

"I think [the belief] comes from definitely more training, but most importantly other match situations against other guys and just the whole process of it. 

"Leading up to it, I 100 per cent believed I could win against anybody. I thought I showed that with the level I could produce out there. Unfortunately, physically it got a little tougher."

Novak Djokovic said "I'll take your legs out, that's for sure" after digging deep to outlast American qualifier Jenson Brooksby in a physically demanding encounter at the US Open.

Djokovic – bidding to become only the third man to claim a calendar Grand Slam and first since Rod Laver in 1969 – rallied from a set down to prevail 1-6 6-3 6-2 6-2 en route to the quarter-finals in New York on Monday.

It was a brutal clash on Arthur Ashe Stadium, 20-time major champion and top seed Djokovic needed almost three hours to see off world number 99 Brooksby, who was making his debut at the iconic venue.

After being blitzed in a 29-minute opening set, Djokovic and Brooksby contested a gruelling 20-minute fifth game in the second set – the latter converting a sixth break-point chance.

Djokovic's physical superiority, however, was on display as the Serb star eventually powered past the spirited 20-year-old at Flushing Meadows.

During the last-16 matchup, former world number one Andy Roddick tweeted, in reference to Djokovic, "first he takes your legs… then he takes your soul".

Djokovic – who will face sixth seed Matteo Berrettini in a repeat of the Wimbledon final – said on court: "Thanks Andy, I take that as a compliment – only the first part.

"The second part, I don't take anybody's soul. Everyone has their soul, we're all beautiful souls so I appreciate everyone. But I'll take your legs out, that's for sure."

Djokovic hit 44 winners in the four-set triumph, to go with 41 unforced errors in a tricky clash under the Arthur Ashe lights.

With his hard-fought victory, Djokovic improved to 11-0 against Americans at the US Open. He is 29-3 at major events and 70-10 in ATP Tour-level matches.

The 34-year-old is on a 21-match winning streak against players from the United States since Sam Querrey snapped his 30-match slam streak at Wimbledon in 2016.

"Great quality match," Djokovic, who can break the record for most men's slam titles – currently level with injured pair Rafael Nadal and Roger Federer, told reporters. "He started off better. I've never played him. I didn't see him play too many times. Maybe few matches in the last few months. Haven't followed his career prior to that, so I didn't know much about him. Had to do some homework and some analysis.

"It's different stepping out on the court first time against someone that really has nothing to lose. He's a young, talented player that is very crafty. He's got the really all-around game. He was pumped. He had the crowd behind him, of course. He played a perfect first set. Everything he intended to do he executed it perfectly.

"On my end, I was just trying to find a rhythm, trying to read his game, trying to understand where I can find holes in his game and start to attack and shift the momentum to my side.

"That happened already at the beginning of the second set. I broke him early. He broke back. But I re-broke his serve right away. We had some very, very long rallies, long games. It took a toll physically I think on both of us at that point. But I managed to find the right serves. I served efficiently when I needed to, opening up the court.

"The third and fourth set were really, really good from my side. I felt I was more dominant. I decreased the unforced errors that were really high in the first part of the match. I just was kind of swinging through the ball better. Was a good finish. It wasn't a good start. But all in all, expected the battle, and I got that one. I'm pleased to overcome it."

World number one Novak Djokovic's quest for a calendar Grand Slam and record-breaking 21st major title remains on track after outlasting Jenson Brooksby 1-6 6-3 6-2 6-2 in a gruelling US Open showdown.

Unheralded American qualifier and world number 99 Brooksby had the crowd roaring following an incredible opening set against Djokovic in Monday's last-16 clash at Flushing Meadows.

However, Djokovic – bidding to become only the third man to sweep all four slams in the same year and first since Rod Laver in 1969 – responded to the almighty challenge, showcasing his superior physicality as the three-time US Open champion rallied into the quarter-finals in New York.

Brooksby was making his first appearance on Arthur Ashe Stadium, where the 20-year-old was looking to become the lowest-ranked player to beat a number one at the US Open since the start of the ATP rankings in 1973 and youngest American man since Andy Roddick (2003 Wimbledon) to reach a major quarter-final.

He was not overawed on the big stage, blitzing Djokovic in a remarkable first set. Playing with a bounce in his step and bringing the crowd to its feet, Brooksby only hit one unforced error in a dominant 29-minute display, which included two breaks of serve.

Djokovic was 38-34 at grand slams when losing the opening set and 12-10 at Flushing Meadows and after an error-filled opener, the Serb star let out an almighty roar after racing out to a 3-0 lead.

Just as Djokovic – level on 20 men's slams with Rafael Nadal and Roger Federer – looked comfortable, he endured a marathon 20-minute fifth game against Brooksby.

Brooksby broke at the sixth time of asking and the breath-taking tennis continued as Djokovic broke straight back to reclaim his advantage at 4-2 – the latter ending the game with an intense stare down in the direction of his opponent.

After a gruelling second set to level the match, the third followed a similar pattern, with Djokovic breaking in the opening game before moving 3-0 ahead.

Djokovic did not relinquish that lead, hitting 13 winners while claiming 11 of his 13 points at the net as he took the match to Brooksby.

Brooksby put up a huge fight but, he was unable to maintain his charge as the crowd went silent – Djokovic looking ahead to a last-eight showdown with sixth seed Matteo Berrettini in a rematch of the Wimbledon final.

Data slam: Djokovic flawless against locals in New York

With his hard-fought victory, which lasted almost three hours, Djokovic improved to 11-0 against Americans at the US Open. He is 29-3 at major events and 70-10 in ATP Tour-level matches. The 34-year-old is on a 21-match winning streak against players from the United States since Sam Querrey snapped his 30-match slam streak at Wimbledon in 2016.

WINNERS/UNFORCED ERRORS

Djokovic – 44/41
Brooksby – 27/28

ACES/DOUBLE FAULTS

Djokovic – 9/1
Brooksby – 4/1

BREAK POINTS WON

Djokovic – 6/12
Brooksby – 3/11

Carlos Alcaraz's fairytale run to the quarter-finals at the US Open is a dream come true for the Spanish teenager.

Alcaraz became the youngest men's US Open quarter-finalist in the Open Era when he ousted Peter Gojowczyk 5-7 6-1 5-7 6-2 6-0 on Sunday.

The 18-year-old, who became the youngest man to defeat a top-three player at Flushing Meadows when he beat Stefanos Tsitsipas last week, is also the most junior male player at the New York grand slam since Thomaz Koch in 1963.

Similarly, Sunday's triumph made him the youngest men's singles quarter-finalist at any grand slam since Michael Chang (18) made the last eight at the 1990 French Open.

Alcaraz will now face another rising star – Felix Auger-Aliassime – for a place in the semi-finals.

"I'm super excited to be in my first second week in the grand slam, so it's amazing for me. It's a dream come true," an ecstatic Alcaraz told reporters.

"It's really tough to play these kinds of matches, to play fifth sets. I hope to play [in] more second weeks, to play more quarter-finals of grand slams.

"I didn't expect to play in the quarter-finals here, so I think it's a really good performance from me in these matches."

Dubbed as the heir to Rafael Nadal's thrown, Alcaraz has certainly had the crowd on his side during his run.

"In the first sets I thought that I reached my limit, physically and mentally. I think the crowd was really, really important for me in this situation," Alcaraz added.

"I felt the energy of the crowd pushing me up. I think without the crowd, it couldn't be possible to be here."

Alcaraz faces a stern test in the form of world number 15 Auger-Aliassime, who has reached his second straight grand slam quarter-final.

However, the 21-year-old Canadian – who is aiming to secure a maiden appearance in the last four of a major – knows the quality Alcaraz possesses.

"He's a great player. At some point age is just a number. He already feels like a player who's established," Auger-Aliassime said of Alcaraz.

"He's playing some amazing tennis, so I think we’ll see a lot of him, a lot of us, a lot of Frances [Tiafoe] in the future."

Teenage Spanish sensation Carlos Alcaraz made history after outlasting Peter Gojowczyk for a US Open quarter-final berth.

Alcaraz became the youngest men's US Open quarter-finalist in the Open Era thanks to Sunday's 5-7 6-1 5-7 6-2 6-0 victory at Flushing Meadows.

After stunning third seed Stefanos Tsitsipas in New York, where he became the youngest man to defeat a top-three player at the US Open, the 18-year-old needed another five-setter to continue his fairytale run.

Alcaraz rallied past Gojowczyk, finishing with 35 winners – five more than the German qualifier – and 45 unforced errors, which were 39 fewer than his opponent.

Dubbed the new Rafael Nadal, Alcaraz became the youngest men's US Open quarter-finalist since Thomaz Koch (18) in the pre-Open Era in 1963.

He also became the youngest men's grand slam singles quarter-finalist since Michael Chang (18) at the 1990 French Open.

With the win, Alcaraz became the youngest men's player to earn back-to-back five-set wins at a grand slam since Chang (16) at the 1988 US Open as Felix Auger-Aliassime or Frances Tiafoe await.

Daniil Medvedev said "it's tough to beat me" as the confident and in-form world number two took another step towards his maiden grand slam crown at the US Open.

Medvedev advanced to the quarter-finals with a comfortable 6-3 6-4 6-3 victory over 24th seed Dan Evans in New York on Sunday.

US Open finalist in 2019 and Australian Open runner-up this year, Russian star Medvedev is yet to drop a set at Flushing Meadows this week.

As Dutch qualifier Botic Van De Zandschulp awaits, Medvedev discussed expectations at the US Open in pursuit of his first major title.

"I always say I take it match by match," Medvedev told reporters after hitting 42 winners in one hour, 43 minutes. "You can lose first round, you can lose final. If I play good, I know what I'm capable of. It's tough to beat me.

"In Wimbledon, I was honest, I lost against a great player, Hubert is playing great. I think he's on the rise. He's going to be even better ranked and maybe he's gonna go further in slams. He beat Roger [Federer] after me.

"But again, I was not talking about match itself where the loss was okay, I would say. I was talking about the result in general, and fourth round is not enough for number two in the world, especially I like grass more than clay, so maybe on clay I would not say this.

"Yeah, it's the same every tournament. If you're top seed, if you are not in the final, let's say Cincinnati, I lost against Rublev, brutal match, really strong play from him. But if you talk about the result itself, semi-final was not good enough.

"There is not much to add. I want to win every tournament I play in, without putting pressure on myself. Because again, I know how to win matches, and I know sometimes why I lose them, so that's just learning and being better for the next time."

Medvedev is 31-5 on hard courts in 2021 and 162-61 in his career, while he has won 11 of his 12 ATP titles on hard courts.

The 25-year-old owns a 17-4 record (80.95 per cent) at the US Open – his most wins and highest win percentage at a grand slam event.

"Feeling great before the second week," Medvedev said. "Feeling great with my tennis, my mental, my physical. Just looking forward."

Medvedev, who lost a thrilling US Open final to Rafael Nadal two years ago, added: "Now I just want to make it to the finals again to have another thing to remember and hopefully a better one."

Tokyo Olympic gold medalist Alexander Zverev refused to get carried away about his chances of winning his maiden major title despite easing into the US Open fourth round on Saturday.

The German fourth seed was leading 3-6 6-2 6-3 2-1 when Jack Sock withdrew with a groin issue which had been plaguing him throughout the match.

Zverev's walkover victory extended his winning run to 14 matches, dating back to his Tokyo 2020 gold medal triumph along with last month's Cincinnati Masters victory.

Reigning champion Dominic Thiem along with Rafael Nadal and Roger Federer all withdrew from the US Open prior to the tournament, opening the door for a first time winner.

"I’m on a 14-match winning streak now," Zverev said during his on-court interview. "I’m playing well. That’s all I want to say, I don’t want to say anything else.

"We all know that Novak is the big favourite, we all know that Daniil [Medvedev] is playing incredible tennis, we all know that there are a lot of other players out there that are playing incredible tennis.

"I think my fourth-round match against Jannik Sinner is going to be extremely entertaining because he’s a young guy that is very hungry and I feel like that’s going to be a high-level match."

Zverev also spoke about his drive to succeed at majors, having struggled earlier in his career.

The German was runner-up at last year's US Open and made the semi-finals at this year's French Open and last year's Australian Open.

Zverev's hopes for going deep at Flushing Meadows will be aided by the premature end to his match with Sock, having won in straight sets in the first two rounds over Sam Querrey and Albert Ramos Vinolas.

The Olympics gold medalist was full of praise for Sock, who has been plagued by injuries, after a dominant opening set.

"Jack I think played the best set of tennis I've ever seen him play," Zverev said. "I did one unforced error in the whole set and I lost it, 6-3, without having really any chances.

"If he would have kept it up I probably would not have won the match… Afterwards when he gets injured, it's a shame because otherwise it would have been an incredible match I think."

Novak Djokovic powered through to week two of the US Open by sinking Kei Nishikori, a player who must be sick of the sight of the Serbian.

For a 17th consecutive time in their rivalry, Djokovic beat the former world number four, who was runner-up at this tournament seven years ago.

A 6-7 (4-7) 6-3 6-3 6-2 victory in three hours and 33 minutes for Djokovic moves him into the fourth round, ever closer to the calendar Grand Slam he is chasing, having already won the Australian Open, French Open and Wimbledon.

Nishikori beat Djokovic in the US Open semi-finals in 2014, before losing to Marin Cilic in the final, but that was the last time he got the better of the man from Belgrade.

Djokovic won their 2018 semi-final at Flushing Meadows for the loss of just nine games and a 6-2 6-0 win for the world number one over Japan's Nishikori at the Tokyo Olympics in July suggested this latest clash in New York, the 20th between them, could be similarly one-sided.

Yet it became clear early in this clash that Djokovic faced a substantial test. He trailed 4-2 in the opener and could not save the set, despite forcing a tie-break. A stunning lob from Nishikori gave him two serves for the set, and he held his nerve to move in front.

Djokovic broke in the third game of the second set though and staved off a flurry of break-back points on his way to levelling the match.

When Nishikori served a double fault to allow Djokovic two break points in game four of the third set, it was inviting trouble. Djokovic won the second of those when his low slice and net rush prompted Nishikori to net a backhand.

Against the flow of the match, Nishikori broke back, helped by two consecutive double faults, but order was restored as Djokovic rolled through the next two games to move a set away from the next round.

Nishikori probably needed Djokovic's body to fail him, or for something as bizarre as last year's disqualification to occur, but nothing of the sort happened in set four, the world's best player in a class of his own.

Djokovic said: "I don't think I started off very well. I was too passive and too far back in the court and he was dictating the play. It took me a little bit of time to adjust to his game.

"By the beginning of the second set I felt like I was getting my groove back, getting my rhythm back. I was very pleased with my focus."

DATA SLAM

Nishikori will look back to the second set and ponder 'what if?', because he had seven break points and took none of them. Djokovic had three in that set and took two, and there lies greatness. Tennis comes down to taking chances as they arrive, being clinical, and after the chaos of the first set this was a ruthless Djokovic show.

WINNERS/UNFORCED ERRORS

Djokovic – 45/52
Nishikori – 38/56

ACES/DOUBLE FAULTS

Djokovic – 15/7
Nishikori – 6/3

BREAK POINTS WON

Djokovic – 7/16
Nishikori – 2/13

Carlos Alcaraz was lost for words after making history in the Spanish teenager's shock five-set upset of world number three Stefanos Tsitsipas at the US Open.

Alcaraz – rated by many as Spain's best young male player since 20-time grand slam champion Rafael Nadal first emerged – sent Tsitsipas packing 6-3 4-6 7-6 (7-2) 0-6 7-6 (7-5) in the third round on Friday.

The 18-year-old Alcaraz became the youngest player to reach the last 16 of the US Open since Americans Michael Chang and Pete Sampras in 1989.

Alcaraz also became the youngest man to beat a top-three opponent at the tournament since the ATP introduced its world ranking system in 1973.

After more than four hours on Arthur Ashe Stadium, Alcaraz told reporters: "I have not words to explain how I feeling right now.

"I just don't know what happened out there in the court. I can't believe that I beat Stefanos Tsitsipas in an epic match.

"For me it's a dream come true."

Amid comparisons with countryman Nadal, Alcaraz added: "Honestly I don't copy any style of a players. I just play my game.

"But if I have to say one player that is similar my game, I think it's [Roger] Federer. I think similar as mine game, trying to be aggressive all the time. I think it's a good similar for me."

After his US Open campaign came to a surprise end, third seed Tsitsipas tipped Alcaraz for future success.

"A hundred percent," Tsitsipas replied when asked if he had a sense of Alcaraz's potential. "I said he can be a contender for Grand Slam titles. He has the game to be there."

"I've never seen someone hit the ball so hard," French Open runner-up Tsitsipas added. "Took time to adjust. Took time to kind of develop my game around his game style.

"It's one of these matches and one of these feelings where, you know, you pick up at some point of the match, you feel like you're in control, and it doesn't really go your way at the end.

"It's kind of bitter, I would say, especially after such an incredible first set by my side, dominating, being just so aggressive, not dwelling on the past. It was a great first set.

"I don't know. I felt like he played the fifth one completely -- the way he played the first set basically, careless, going for every single shot. I have never seen someone play such a good fifth set, honestly."

Carlos Alcaraz put his name up in lights in New York as the 18-year-old stunned third seed Stefanos Tsitsipas in a massive US Open third-round upset.

Spanish teenager Alcaraz scored an astounding 6-3 4-6 7-6 (7-2) 0-6 7-6 (7-5) victory in a battle lasting four hours, seven minutes inside Arthur Ashe Stadium on Friday.

French Open runner-up Tsitsipas became the biggest casualty of the men's tournament so far as hot prospect Alcaraz showed his mettle on the grand slam stage at Flushing Meadows.

It means Alcaraz, rated by many as Spain's best young male player since Rafael Nadal first emerged, has reached the fourth round of a major for the first time in his career.

He becomes the youngest player to reach the last 16 of the US Open since Americans Michael Chang and Pete Sampras in 1989.

The US Open said the win made Alcaraz the youngest man to beat a top-three opponent at the tournament since the ATP introduced its world ranking system in 1973.

Alcaraz put a dire fourth set behind him and looked to have won the match with a lob at 6-4 in the deciding tie-break, but his ball landed a whisker long.

That meant the players were back on serve, but Alcaraz was unbowed and sealed victory with a scorching forehand winner, announcing himself as a likely superstar of the near future. He struck 61 winners in all.

He will face German qualifier Peter Gojowczyk in the fourth round, with a quarter-final place at stake.

Speaking on court after his win, Alcaraz hailed the supportive New York spectators who were firmly in his corner.

"I think without this crowd I haven't the possibility to win this match," he said. "Thank you to you the crowd for pushing me up in the fifth set

"It has been an incredible feeling for me. This victory means a lot to me. It's the best match of my career, the best win.

"For me to beat Stefanos Tsitsipas is a dream come true for me and to do it here is more special."

Novak Djokovic says he was not acting like a "spoiled brat" when he complained about a rowdy spectator during his US Open defeat of Tallon Griekspoor.

World number one Djokovic took another stride towards a first calendar Grand Slam and a record 21st major title by beating Dutchman Griekspoor 6-2 6-3 6-2 in the second round on Thursday.

Top seed Djokovic, who will face Kei Nishikori in the third round, had to contend with a member of the crowd trying to unsettle him in Arthur Ashe Stadium.

He shouted as the Serb went for an overhead smash that he missed and continued to be vocal during points, prompting Djokovic to express his grievances with the chair umpire.

Djokovic feels it is important to make it clear that sort of behaviour should not be tolerated.

"When tennis players talk about that, someone who is watching team sports would say, 'What a spoiled brat'," the three-time US Open champion said.

"But it's a different sport. Look, there's a lot of noise happening on the stadium, particularly in the night sessions. I don't mind that.

"Even sometimes during the point it happens that people out of excitement, they just scream, or they release like a sound or whatever, sigh, whatever you call it. And that's fine.

"But if someone intentionally does it over and over again, then I have tolerance up to a certain point, then it's not correct, then it's not fine. It's not fair. I feel like it's not good for us players.

"I mean, particularly that guy for some reason was calling, raising the sound and kind of screaming just before I would hit my smash, which was a big point. Before that he would do [it] a few times. After that again.

"That wasn't nice. That's all. I don't mind the noise. Don't get me wrong. I think it's important for the entertainment, for the crowds, the music.

"I get it. But if someone does it over and over again, particularly when you are at his side, he knows why he's doing it. The guy that I pointed out, he knew exactly what he was doing, and that's all."

Novak Djokovic welcomed the ongoing 'GOAT' discussion alongside Rafael Nadal and Roger Federer after the world number one took another step towards an historic grand slam title at the US Open.

Djokovic, Nadal and Federer share the most men's slams in history with 20 but the former has the chance to break the record at Flushing Meadows, where the top seed dismantled unheralded Dutchman Tallon Griekspoor 6-2 6-3 6-2 in the second round on Thursday.

Serb star Djokovic is also bidding to become just the third man to complete a calendar Grand Slam and the first to sweep all four majors in a year since Rod Laver in 1969.

It is widely debated who is the greatest player of all time among Djokovic, Nadal and Federer – the latter two are both absent from this year's US Open due to injury.

After reaching the third round in New York, Djokovic was asked who the better player on a neutral surface is, given Nadal's clay-court dominance and Federer's grass-court expertise.

"It's difficult to say who is better. Three of us, we're all so different. We have different styles," Djokovic said during his post-match news conference.

"We have different trajectories or journeys to where we are at this moment. We all had tremendous success, some more particularly on one surface, some the other surface.

"We do complement each other. I think the rivalry between the big three, so to say, it's phenomenal for our sport.

"So the more traction, the more conversation there is around the three of us, the GOAT discussion, et cetera, the better in general for our sport. I hope people still keep on talking about it."

Djokovic added: "I think actually one of the best I think images that I've ever seen from tennis is them [Nadal and Federer] playing on a half-grass, half-clay court.

"I thought that was fantastic. Whoever came up with the idea was genius. As a tennis fan, I enjoyed that very much."

Djokovic hit 33 winners, fired down 13 aces and broke six times throughout a dominant performance against Griekspoor under the Arthur Ashe Stadium lights.

The 34-year-old also improved to 53-1 against non-top 100 opponents at majors, while he is now 13-0 against them at the US Open.

Kei Nishikori awaits Djokovic, who owns a 17-2 head-to-head record against the 2014 US Open runner-up.

"We played many times. I have very good score against him," Djokovic said of Nishikori. "I lost I think last time here in New York in semis in 2014. Historically I think his most successful grand slam is here. He's one of the quickest and most-talented players that I've seen in my lifetime, in my career.

"I think it's important for me to serve well and try to take off the pace a little bit because he likes the pace. He likes to hit the ball early, protect the line. But I know his game well. We played in Olympic Games. I know what's expecting me. I look forward to a good challenge."