Rafael Nadal reached the Australian Open quarter-finals for the 13th time in his career with a straight-sets win over Fabio Fognini.

The Spanish star again looked in strong form in a 6-3 6-4 6-2 victory over Italian 16th seed Fognini behind closed doors on Rod Laver Arena on Monday.

Nadal, who is aiming to win a men's record 21st grand slam title in Melbourne, is yet to drop a set at the year's first major and beat Fognini for the 13th time in 17 meetings.

The world number two will face either Stefanos Tsitsipas or Matteo Berrettini in the last eight.

Nadal gave up an early break lead against Fognini but a powerful forehand return led to another and a 4-2 lead.

Despite serving at just 42 per cent, Nadal closed out the opening set.

Fognini was unable to consolidate a break lead in the second set, having led 4-2, before Nadal recovered from 0-40 down to hold in the eighth game.

That would prove a decisive hold, Fognini blasting a ball into the stands after netting a volley to give Nadal a break point, converted when a forehand went wide before the Spaniard secured the set.

Fognini handed Nadal his only loss from two-sets-to-love up at a grand slam at the US Open in 2015, but a break for 2-1 in the third saw the latter end any chances of a repeat on his way to a convincing win.

Data Slam: Nadal's fine Australian Open record
Only at the French Open, where he is a 13-time champion, has Nadal reached the quarter-finals more often (14) than at the Australian Open. Roger Federer (15) and John Newcombe (14) are the only men to have reached more Australian Open quarter-finals.

WINNERS/UNFORCED ERRORS
Nadal – 24/20
Fognini – 32/35

ACES/DOUBLE FAULTS
Nadal – 6/3
Fognini – 7/3

BREAK POINTS WON
Nadal – 6/19
Fognini – 2/6

Brooklyn Nets star Kevin Durant will miss at least two games due to a mild left hamstring strain.

The Nets confirmed the injury on Sunday, a day after Durant returned from the NBA's health and safety protocols amid the coronavirus pandemic to help Brooklyn past the Golden State Warriors 134-117.

Durant, who posted 20 points against former team the Warriors in his first game back in the Bay Area, will sit out Monday's clash with the Sacramento Kings and Tuesday's game against the Phoenix Suns.

Former NBA MVP and two-time champion Durant is averaging 29.0 points, 7.3 rebounds and 5.3 assists per game for the Nets this season.

Durant, who sat out his first season in Brooklyn due to an Achilles injury sustained in the 2019 NBA Finals during his time with the Warriors, has missed nine of 28 games in 2020-21.

The star-studded Nets (16-12) are third in the Eastern Conference following back-to-back wins.

Serena Williams is moving better than she has in years, according to her coach Patrick Mouratoglou.

Williams, 39, has looked in good form at the Australian Open as she eyes a record-equalling 24th grand slam singles title.

The American has dropped just one set on her way to the quarter-finals, in which she faces Simona Halep on Tuesday.

Mouratoglou said Williams' movement was the best it has been in several years.

"First of all, it's something that we have put the emphasis on because in tennis that's probably one of the most important things. If you are late on the ball, you can't do what you want to do. Sometimes you don't even touch the ball," he told a news conference on Monday.

"It's a sport where you have to be able to move fast from side to side and long enough. It's something that probably in the last two, three years, this had consequences for Serena.

"Even more, when you're not in a good day, you need a plan B. To be able to have a plan B, you have to be able to move well. If you can't move well, there is no plan B. The only plan is attack.

"I think it cost her a few important matches. So we have decided to find a way to bring back the footwork that she used to have in the past. I feel like she's done a great job. She's moving much better."

Williams last won a major title in Melbourne in 2017, losing four grand slam finals since then.

With all eyes on her as she aims to equal Margaret Court's record of 24 grand slam singles titles, Mouratoglou insisted that mark was not an obsession for Williams.

"Does she need that validation? I don't think she needs that validation.  But, I mean, clearly she came back to tennis to win some other grand slams, so that's for sure the goal," he said.

"Now, she's not as obsessed with the 24 than most of the people in the tennis world, but definitely she wants to win grand slams. That's the only reason why she came back to tennis."

Kemba Walker is confident the Boston Celtics will overcome their form slump after falling to another loss on Sunday.

The Celtics suffered their 10th loss in their past 15 games with a 104-91 defeat to the Washington Wizards.

Walker, who posted 25 points in the loss, was upbeat about the Celtics' chances of turning their season around.

"We've got to change some things, and we will. We will," Walker said.

"I'm very confident that we will change things and we will continue to get better. It'll change because it's not a great feeling the way we're playing. It can't get no worse than this. We're going to fix it."

Jaylen Brown also posted 25 points, but Jayson Tatum struggled, going three-of-14 from the field for just six points in 23 minutes.

Walker said the Celtics, who are now 13-13, would work together, with their next outing coming against the Denver Nuggets on Tuesday.

"Teams go through adversity every single year at some point in the season," he said.

"It's all about how you overcome it. The only way you can overcome adversity is by doing it as a whole, doing it together. And that we will do."

Romelu Lukaku answered any recent criticism aimed in his direction against Lazio and Christian Eriksen is starting to understand what Inter require of him, says Nerazzurri coach Antonio Conte.

Inter bowed out of the Coppa Italia at the semi-final stage after a goalless draw at Juventus ensured a 2-1 aggregate defeat, but a 3-1 triumph over Lazio on Sunday saw Conte's side leapfrog rivals Milan at the top of Serie A.

Lukaku scored twice in the first half to move on to 300 career goals, and Lautaro Martinez was on target after Gonzalo Escalante had replied for the visitors at San Siro.

Speaking about the Belgium striker's showing, Conte told Sky Sport: "Romelu, like the whole team, gave a great response. Lautaro did, so did Ivan Perisic, the defenders, Marcelo Brozovic. They all stepped up.

"Some were starting to murmur about Lukaku after the Coppa Italia and a few lacklustre performances, suggesting he had some psychological blowback from that, but there are moments when you are not at 100 per cent.

"He came back firing on all cylinders and we need this Romelu. We need this determination and passion from everyone in the team."

Eriksen signed from Tottenham amid much fanfare in January 2020 but struggled to hit the ground running and was heavily linked with an exit last month.

However, the Denmark playmaker stayed put and has since impressed, something Conte puts down to becoming familiar with the requirements of Italian football.

"I think Christian had a few problems settling in, understanding Italian football, which is very difficult and tactical compared to the Premier League. There is also a far greater intensity now than in previous years here," Conte added.

"We tried in every way to settle him in, even changing tactical system. I think now he has made a step towards us, is starting to understand Italian, which is an important development too. He is understanding what we need.

"Eriksen was very focused when defending as well as attacking. He has a different power to his leg now after the fitness work.

"He's an extra option for us and I am more comfortable relying on him now."

Next up for Inter is a huge derby clash with Milan, a match that is sure to have huge ramifications on the outcome of the Scudetto.

Conte is relishing the challenge after seeing off a Lazio side that had won six straight league games.

"This was an objective we'd been chasing for a long time, to get to the top of the table, we achieved it after a game against a very strong team," he added.

"I congratulate Lazio and Simone Inzaghi, as they are tough, organised and with a lot of quality.

"The fact they were coming off six consecutive victories shows their strength, but at the same time it shows our mental strength.

"I am happy for the lads, inevitably this must be a starting point for us and not the finish line. We know the next game is the derby with Milan, going into it ahead is obviously much better.

"It's going to be a fascinating game between two teams who have strong ambitions."

Romelu Lukaku scored twice and assisted another to help Inter to a 3-1 win over Lazio that lifted Antonio Conte's men above bitter rivals Milan to the top of Serie A.

Milan's shock 2-0 loss to Spezia on Saturday opened the door for Inter and they pounced at San Siro on Sunday, taking a one-point lead into next weekend's huge Derby della Madonnina.

Lazio were furious with the awarding of Inter's 22nd-minute penalty as replays appeared to show Wesley Hoedt, drafted in after Stefan Radu was injured in the warm-up, got some of the ball before taking out Lautaro Martinez.

Lukaku converted and added a second ahead of half-time with the assistance of VAR, before teeing up Martinez to seal the points after Gonzalo Escalante had given Lazio some temporary hope.

There had been little between the sides prior to the controversial penalty call, with the VAR standing by referee Michael Fabbri's decision to point to the spot for Hoedt's challenge on Martinez.

Lukaku sent Pepe Reina the wrong way to extend his perfect penalty record in Serie A to 10 from 10, and the Belgium international did not have to wait long for the landmark 300th career goal for club and country.

It had an element of fortune about it as Marcelo Brozovic slid in on Manuel Lazzari and the ball ricocheted into the striker's path, though it took a lengthy VAR check to ascertain that Lukaku was level with the last man when the initial pass was played.

Lazio had found the net in each of their past 17 league outings, however, and they kept that run going when Sergej Milinkovic-Savic's free-kick heavily deflected off substitute Escalante and beat Samir Handanovic on his 500th Serie A appearance.

But just when the visitors had some momentum on their side, Lukaku charged down the right, held off Marco Parolo and unselfishly squared the ball for Martinez to tap into an empty net.

Reina denied Lukaku a hat-trick with a good save down low but Inter, knocked out of the Coppa Italia by Juventus in midweek, retained their two-goal cushion to move to the summit.

Romelu Lukaku scored twice in the first half of Inter's Serie A clash with Lazio on Sunday to bring up the 300th goal of his career.

The Belgium striker opened the scoring from the penalty spot at San Siro and added a second late in the opening period - the goal allowed to stand after initially being ruled out for offside.

Lukaku moved onto 56 goals for Inter in all competitions since joining from Manchester United in August 2019, 16 of those coming in the league this season.

That is one fewer than the 27-year-old has scored for his national side at senior level, though he still has some way to go before equalling the 87 netted for Everton between 2013 and 2017.

Lukaku's other goals were scored for United (42), Anderlecht (41) and West Brom (17). He failed to register for Chelsea, despite spending three years on the London club's books - two of those out on loan - and making 15 appearances.

Pierre-Emerick Aubameyang revelled in his stunning return to Arsenal's starting line-up after his hat-trick propelled the Gunners to a 4-2 win over Leeds United.

Aubameyang put Arsenal 2-0 up by the 41st minute of Sunday's clash, opening the scoring early on before doubling his tally with a penalty.

The spot-kick marked his 200th goal across Europe's top five leagues, with the 31-year-old then completing his first Premier League hat-trick two minutes after the restart.

That goal, which came after Hector Bellerin had rounded off a neat team move, put Arsenal 4-0 up, though Pascal Struijk and Helder Costa made life uncomfortable in the second half.

Aubameyang had not started a league match since January 18, with the Gabon striker having been handed a leave of absence to help care for his ill mother.

He was quick to hail the support he received from Arsenal, both internally and from the fanbase.

"Happy, really happy, and my kids are going to be happy because they're going to get it [the match ball]," Aubameyang told Sky Sports.

"Really happy with the performance from the team today, we knew that it was going to be a hard game, they never gave up, they fought a lot, in the end I think we had good game management.

"Maybe a bit nervy [at 4-2] but we managed it well in the end, we won the game. It was important to show that this is our home, this is where we have to win games.

"It means a lot to me. I'm a guy who always works hard, tries to give the best, for first my family and then the team as well. It's been a tough time for me but now it's time to get the smile back, score goals and win games.

"From everybody around the club, everyone was giving a lot of love to me, my mum and my family – I'm really proud to be part of this family, I have to say thank you to everyone at the club and the fans as well because I received a lot of messages.

"Today's win and the goals are for them."

Mikel Arteta was delighted with the all-round discipline and intensity shown by his side – factors he believes are the only way to match up to Marcelo Bielsa's free-flowing team, who have now conceded 42 goals but also scored 40 in the league.

"Very pleased with the result, very happy with the performance, especially in the first half against a fantastic team that make life so difficult for you and really put high demands into every action, with or without the ball," Arteta told Sky Sports.

"We read the situations really well and created big problems for them. I said to the players at half-time that Leeds will never give up, they throw everything at you and that's what they've done. We scored the fourth goal, could have scored more but they made it hard.

"Every action, you have to be full gas. If you don't take the game like that you are in big trouble. You have to be very precise to find the next pass, the next movement.

"It was great, the amount of chances we created and the types of goals we scored, I am really pleased with that."

Andy Farrell said Ireland are "hurting" physically and mentally after they suffered a 15-13 Six Nations defeat to France at the Aviva Stadium on Sunday.

Les Bleus ended a 10-year wait for a win in Dublin, digging deep to make it two wins out of two and consign the men in green to back-to-back defeats at the start of a Six Nations campaign for the first time.

France were clinical and defended brilliantly, with Charles Ollivon scoring a classy first-half try against the run of play and Damian Penaud crossing after the break.

Ronan Kelleher's first Test try after 57 minutes left a gripping battle in the balance and Ross Byrne's mammoth long-range penalty set up a tense finale, but France held on to leave Ireland's title hopes all-but over.

Ireland were already without Johnny Sexton, Conor Murray and James Ryan due to injury and their luck at the start of the tournament was summed up when Iain Henderson and Cian Healy had to go off with blood streaming from their heads after a collision.

Both players were able to return but they were unable to prevent another defeat in a game of fine margins, with James Lowe's first-half try ruled out by the TMO as his foot made contact with the touchline. 

Ireland head coach Farrell said: "I thought we managed the game really well in the first half – even though the rain stopped it was still very wet, and obviously the French like to come with a lot of line speed.

"They defended really well in those last two minutes there. I thought the plan was going according to plan and we were doing very well set-piece wise, and our game management was very good. I thought we just lost our way a little bit in the third quarter there, and that got them back into the game.

"I suppose, really, when you look at it, if you give them set-pieces in your own half, they get over the gain line first phase, come round the corner second phase and get into their offloading game, then they're free-flowing. Some of that was a little bit soft from us.

"A lot of lads that are hurting in there – physically hurting as well as mentally. Because they put their bodies on the line for their country. The effort's not the problem at all, but it still hurts to lose this game."

Zinedine Zidane and Toni Kroos have lamented Real Madrid's growing injury issues after full-back Dani Carvajal limped off in Sunday's 2-0 win over Valencia.

Carvajal was making his first appearance for Madrid since January 2 but lasted just 28 minutes before sustaining an apparent injury to his right thigh.

He has been restricted to 12 games in all competitions this term and is now considered a big doubt for the Champions League last-16 first leg with Atalanta on February 24.

The Spain international joins the likes of Sergio Ramos, Eder Militao, Alvaro Odriozola, Eden Hazard, Rodrygo, Federico Valverde and Marcelo on the sidelines.

Madrid boss Zidane is concerned about the long list of injuries he has had to contend with this term and is unsure why so many players have been ruled out of action.

"There are a lot of injuries," he told Movistar. "I'm worried because when you lose a player it bothers me. It's a relapse [for Carvajal]. 

"I'm sorry for him because he was fine to play and is a very important player to us. But I can't explain all these injuries."

Asked if the packed fixture schedule is to blame, with Madrid playing nine times since the turn of the year, Zidane said: "I'm not going to get into that.

"We already have enough trouble. The calendar is what it is. We didn't have a normal pre-season and there are many injuries. 

"I hope to get my players back but I'm not going to get involved in the rest."

Lucas Vazquez replaced Carvajal at right-back and slotted in seamlessly by teeing up Kroos for Madrid's second, 30 minutes after Karim Benzema had opened the scoring.

Kroos, who scored and assisted a goal in the same Madrid match for the first time since November 2018, joined Zidane in bemoaning his side's injury nightmare.

"It worries us a lot, of course. We are without important players," he said. "Dani has come back from three injuries in a row - it's not right, we don't like it.

"But the others have to do as much as possible. We can't change the situation, just accept it."

Valencia managed just one attempt on target at Estadio Alfredo Di Stefano - Maxi Gomez's shot from range - in what was a routine third successive league win for Madrid.

Zidane's men have now kept back-to-back clean sheets and the Frenchman is pleased with the improvement made by his side at the back.

"That much is evident," he said. "We believe a lot in what we do. We are overcoming difficulties and there is a lot left for us to give."

Madrid, who have now gone 13 home LaLiga matches without losing to Valencia, are five points adrift of Atletico Madrid having played two games more than the league leaders.

But two-time title-winning boss Zidane is not yet giving up hope of chasing down rivals Atletico, who Madrid face at Wanda Metropolitano on March 7.

"We are going to continue doing what we are doing," he said. "We are not going to look at what others are doing. Today we played a very good game. 

"They all defended very well without the ball and when got forward we caused a lot of damage. We have to continue in this way."

Valencia head coach Javi Gracia has won only one of his eight LaLiga games against Madrid and took full blame for his side's lacklustre display in the Spanish capital.

"It was a bad game from us," he said. "I do not know if it was our worst of the season but one of the worst. The intention was to be more aggressive, it was very easy for them.

"The coach has the maximum responsibility in everything. This is a step backwards in our trajectory. From the first minute we have not been able to demonstrate anything. 

"We have not seen options to achieve anything positive here. We could not even link two passes"

Mohammad Nawaz and debutant Zahid Mahmood starred as Pakistan held their nerve to a seal a 2-1 Twenty20 series win over South Africa despite the best efforts of David Miller and Tabraiz Shamsi.

The Proteas were rocking at 65-7 and thinking of the plane home, with the brilliant Zahid taking 3-40 and Nawaz 2-13 to leave the tourists in a spin in Lahore.

All-rounder Miller made it a contest by clubbing an electric 85 off just 45 deliveries to steer South Africa to 164-8.

Shamsi's outstanding 4-25 made things even more interesting but ultimately the poor showing from the top order told as Pakistan secured a four-wicket win with eight balls to spare.

South Africa started poorly as Mohammad Nawaz's ripper clipped off Reeza Hendrick's (2) thigh and from his next over more early turn saw JJ Smuts (1) sky one that Babar Azam pouched running back from the ring.

Pite van Biljon (16) struck Hasan Ali for three consecutive fours in the sixth over before trying for one too many and seeing the spinner find a huge gap.

Zahid then came to the fore, Heinrich Klaasen (0) top-edging to short fine leg and Janneman Malan trapped lbw, while Andile Phehlukwayo (0) survived a leg before appeal in the same over.

Phehlukwayo fell to Usman Qadir in the next over and Zahid had a third when Dwaine Pretorius (9) - star of the second T20 - had his middle stump torn up.

It was Miller time from there, though, as South Africa's dangerman single-handedly made it a contest - slapping seven sixes and five fours in a sensational knock.

Miller cleared the ropes a couple of times off Zahid in the 13th over, before unloading for four sixes from the final set off Faheem Ashraf to give Pakistan a genuine chase.

Pakistan were looking pretty serene with a 51-run opening stand between Mohammad Rizwan (42) and Haider Ali (15) but Shamsi's turner left the latter's technique exposed and the same man had the former trapped plumb lbw.

Things became even more tense with Shamsi accounting for Hussain Talat (5) and Asif Ali (7), with Babar's industrious 44 coming to an end between those dismissals.

Faheem fell for 10 as Pakistan's legs wobbled but Nawaz (18) and Hasan (20) steered the hosts over the line, the latter clubbing a six over midwicket to seal the series in style.