World number one Daniil Medvedev strolled to victory for his first title of the year at the Los Cabos Open with a 7-5 6-0 demolition of reigning champion Cameron Norrie on Saturday.

The Russian, returning to hard-court tennis in Mexico this week ahead of his US Open title defence, pulled away after an injury timeout late in the first set to comfortably triumph against the 12th-ranked Briton.

Medvedev won every game after the timeout, taken for treatment on a hand issue, after scores were locked at 5-5, with both players having broken serve in the first set.

The third-seeded defending champion had no answers in a lopsided second set which only lasted 26 minutes.

This year's Australian Open runner-up, playing in his fourth final of the season, sent down 5-0 aces and converted six of 10 break points for the match to secure his 14th career title. He was exceptional on serve, with a 67 per cent first-serve win percentage.

The triumph capped an excellent week for Medvedev, who did not drop a set across five wins.

"Every match was very good, but the final match is always special," Medvedev said on court after the match. "It's always a high-level match and I'm really happy I managed to show some good levels and play some good shots."

Wimbledon finalist Nick Kyrgios will take on unseeded Japanese Yoshihito Nishioka in the Washington Open final on Sunday after maintaining his unblemished record at this year's event with a 7-6 6-3 victory over Mikael Ymer on Saturday.

Kyrgios, who won in Washington DC in 2019, had played twice on Friday following rain delays on Thursday but found his passage through with 10 aces including one on match point to secure victory in one hour and 34 minutes.

"I didn’t play anywhere near my best tennis today," Kyrgios said. "I served pretty solid, but from the back of the court I didn’t play well at all. I'm just happy to be in the final once again."

Kyrgios is yet to drop serve throughout this year's tournament and has knocked off seeds Francis Tiafoe, Reilly Opelka and Tommy Paul along the way.

The Australian will take on Nishioka who stunned top seed Andrey Rublev 6-3 6-4 in one hour and 20 minutes to secure a spot in his third career final, beating a top 10 opponent for the third time in his career.

Rublev blasted 21-8 winners but also hit 31-14 unforced errors, with the Japanese's consistency proving enough for victory.

Shelby Rogers continued her dream run at the Silicon Valley Classic with victory over ninth seed Veronika Kudermetova securing a spot in the final against last year's runner-up Daria Kasatkina who toppled Paula Badosa.

Unseeded 29-year-old American Rogers has knocked off top seed Maria Sakkari along with Amanda Anisimova and 2019 US Open winner Bianca Andreescu on her way to the decider.

Rogers is also yet to drop a set, maintaining that run against the higher-ranked Kudermetova for a 6-3 6-4 victory in one hour and 20 minutes.

The triumph marks Rogers' biggest final in her career and her first on tour in six years.

Rogers, who trailed 2-0 in the second set, broke Kudermetova's serve with her second match point to clinch victory.

Second seed Badosa was bundled out by Kasatkina 6-2 6-4 in 46 minutes in the other semi-final on Saturday.

Badosa did not appear 100 per cent physically throughout the match and Kasatkina capitalised to secure back-to-back finals in San Jose.

The Spaniard had three break points in the decisive game before Kasatkina converted her first match point.

Kaia Kanepi and Liudmila Samsonova both powered their way into the Citi Open final with comfortable victories on Saturday.

Sixth seed Kanepi ruthlessly swept aside Australian Daria Saville 6-3 6-1 in one hour and 13 minutes, moving her closer to her fifth career title. The 37-year-old Estonian blasted 18 winners for the match.

World number 60 Samsonova proved too good for China's Wang Xiyu, winning 6-1 6-1 in one hour and seven minutes. Samsonova's big hitting was a key feature behind her win with four aces and 17 winners.

Nick Kyrgios started his Friday by finishing off his third-round win against Reilly Opelka, and his business was not finished until after 1am local time when he defeated Frances Tiafoe 6-7 (5-7) 7-6 (14-12) 6-2 in the quarter-final.

Due to length rain delays on Thursday, Kyrgios was one of five players forced to abandon their matches and return to finish them first thing on Friday, with Kyrgios and Russia's Andrey Rublev the only two to successfully navigate both.

Tiafoe defeated Botic van de Zandschulp 4-6 6-2 6-3 in the morning, but Kyrgios' ability to keep his service games short was a decisive factor, winning the ace count 35-14 and not conceding a single break all match.

Rublev had to deal with Maxime Cressy in the morning, winning 6-4 7-6 (10-8), setting up a quarter-final later at night against J.J. Wolf after the American defeated Holger Rune 7-5 4-6 6-3.

Rublev made his second match look far easier, cruising through 6-2 6-3 to earn a semi-final against Japan's Yoshihito Nishioka after he needed over three-and-a-half hours to beat Daniel Evans 7-6 (7-5) 4-6 7-5.

In an all-unseeded semi-final, Kyrgios will play Sweden's Mikael Ymer, who fought his way past Sebastian Korda 6-2 5-7 6-3 after the American beat Bulgaria's Grigor Dimitrov 4-6 6-1 6-2 earlier in the day.

Meanwhile, down in Mexico at the Los Cabos Open, Daniil Medvedev earned his spot in the final by defeating Serbia's Miomir Kecmanovic 7-6 (7-0) 6-1.

Medvedev will play England's Cameron Norrie for the title after he prevailed in arguably the match of the tournament against top-10 talent Felix Auger-Aliassime 6-4 3-6 6-3.

Despite being ranked fourth in the world, Paula Badosa came into her quarter-final showdown with the red-hot Coco Gauff as the underdog, but she played like a favourite en route to a 7-6 (7-4) 6-2 victory.

Usually one of her stronger weapons, Gauff's serve was a liability on Friday, with six double faults in the first set alone to drop the opening frame despite breaking Badosa twice.

In the second set, while Badosa was converting 92 per cent (11-of-12) of her accurate first serves into points, Gauff's figure was down at 53 per cent (eight-of-15) as the Spaniard's return game was at its best.

Badosa will meet seventh seed Daria Kasatkina in the semi-final after the Russian beat Belarus' Aryna Sabalenka 4-6 7-5 6-0. The longer the match went, the less effective Sabalenka became with her ability to return serve.

In the first set, which Sabalenka won, she was successful in 53 per cent (19-of-36) of the points against Kasatkina's serve, and that number plummeted to 14 per cent (two-of-14) in the decider.

Third seed and Wimbledon finalist Ons Jabeur was eliminated by ninth seed Veronika Kudermetova 7-6 (7-5) 6-2, and she will meet unseeded American Shelby Rogers in the second semi-final after she defeated Amanda Anisimova 6-4 6-4.

Meanwhile, in Washington at the Citi Open, Emma Raducanu felt the effects of her gruelling match 24 hours prior as she went down 7-6 (8-6) 6-1 to Liudmila Samsonova.

On Thursday, Raducanu played in the longest two-set match of the WTA season as she eventually made her way through two tiebreakers against Camila Osorio in two hours and 49 minutes, and she ran out of steam after another tough tie-break against Samsonova.

Samsonova will play China's Xiyu Wang in the semi-final after another upset, knocking out fourth seed Victoria Azarenka in convincing fashion 6-1 6-3.

Estonia's Kaia Kanepi booked her place in the second semi-final after a 6-7 (4-7) 6-4 6-3 win against Anna Kalinskaya, where she will meet Daria Saville after the Australian got the better of Canada's Rebecca Marino 6-1 7-5. 

Rafael Nadal has withdrawn from the Canadian Open as the Spaniard has not fully recovered from an abdominal tear. 

Nadal's bid to complete a rare clean sweep of the grand slams ended when he suffered an injury setback at Wimbledon last month.

The 22-time major champion pulled out ahead of a semi-final against Nick Kyrgios, who received a walkover and lost to Novak Djokovic in the championship match.

Nadal was due to return in Montreal next week, but on Friday revealed he will not travel to Canada to play in a tournament he has won five times.

The world number three wrote on Twitter: "From the vacation days and my subsequent return to training, everything has gone well these weeks. Four days ago I also started training the service and yesterday after training, I had a little discomfort that was still there today.

"We have decided not to travel to Montreal and continue with the training sessions without forcing ourselves. I sincerely thank the tournament director, Eugene [Lapierre], and his entire team for the understanding and support they have always shown me and today was no exception.

"I hope to play again in Montreal, a tournament that I love and that I have won five times in front of an audience that has always welcomed me with great affection.

"I have no choice but to be prudent at this point and think about health."

Nadal's withdrawal comes just over three weeks before the US Open gets under way at Flushing Meadows.

Djokovic has also withdrawn from the Montreal event, having been ineligible to enter Canada due to being unvaccinated against the COVID-19 virus.

Daniil Medvedev showed on Thursday why he is the top overall seed at the Los Cabos Open, comfortably handling the challenge of Ricardas Berankis in a 6-2 6-2 win.

The world number one gave Berankis no avenues into the match, winning 48 per cent (27-of-56) of his total return points, while also converting 88 per cent (21-of-24) of his own successful first serves into points.

Medvedev will meet Serbia's Miomir Kecmanovic in the semi-final after he pulled off an impressive 6-2 6-4 victory against American Brandon Nakashima.

Kecmanovic's ability to serve his way out of trouble was the deciding factor, saving four of five break-point opportunities, while Nakashima could only save six out of 10.

Canada's Felix Auger-Aliassime booked his spot in the second semi-final after defeating America's Steve Johnson 6-4 7-6 (7-3).

The 22-year-old winner – who now sits ninth in the world rankings – served up 17 aces in the contest, while Johnson, who is usually known for his serve, could only muster four.

Cameron Norrie was a straights-sets winner over Radu Albot, although he needed a second-set tie-break to get the job done in a 6-3 7-6 (7-4) triumph.

Meanwhile, Norrie's British compatriot Daniel Evans won a war of attrition against American Taylor Fritz at the Washington Open, pulling ahead 3-6 7-6 (8-6) 4-1 before the heavy favourite retired due to the oppressive conditions.

With rising temperatures, combined with spots of rain, the humidity threatened to claim a number of scalps as multiple players in Thursday's action took extended medical timeouts, before a serious downpour halted the rest of play.

The only other matches to reach their conclusion were Yoshihito Nishioka's 7-6 (7-2) 7-6 (7-1) win against Karen Khachanov, and a 6-3 6-7 (3-7) 6-4 triumph for Sweden's Mikael Ymer against Finland's Emil Ruusuvuori.

When play resumes, Nick Kyrgios will look to finish off Reilly Opelka after reaching the rain with a 7-6 (7-1) 2-1 lead, and Grigor Dimitrov won his first set 6-4 against Sebastian Korda.

Botic van de Zandschulp was the beneficiary of the break against Frances Tiafoe, winning the first set 6-4 before slowing down in a big way to drop the second 6-2, but he will get a chance to recharge his batteries before the decider.

Coco Gauff was too sharp with her return game for Naomi Osaka in the second round of the Silicon Valley Classic on Thursday, coming away with a 6-4 6-4 win.

Gauff – the world number 11 and tournament's sixth seed – created 12 break point opportunities in the match, while only allowing one for Osaka, despite eight double-faults.

Ultimately, Gauff won 41 per cent (29-of-71) of the points off Osaka's serve, while converting 85 per cent (28-of-33) of her successful first serves into points.

Earlier in the day in a major upset, top seed Maria Sakkari was eliminated in straight sets 6-1 6-3 by American Shelby Rogers. 

The world number three struggled with her serve throughout, landing only 45 per cent of her first serves, and winning just 52 per cent (12-of-23) of those points.

World number six Aryna Sabalenka needed three sets to defeat unseeded American Carolina Dolehide 5-7 6-1 7-5, and Russia's Veronika Kudermetova had less trouble dispatching Claire Liu 6-2 7-5 to set up an exciting match with Ons Jabeur in the quarter-final.

Meanwhile, in Washington at the Citi Open, Emma Raducanu played in the longest two-set match of the WTA season, defeating Camila Osorio 7-6 (7-5) 7-6 (7-4) in two hours and 49 minutes.

Both women created at least a dozen break point opportunities, with four total breaks each as the young British star battled blisters on her hands.

Raducanu will play Liudmila Samsonova after the Russian eliminated Australia's Ajla Tomljanovich 4-6 6-3 6-2.

In the last match of the day, China's Xiyu Wang got the better of Croatia's Donna Vekic 4-6 7-5 6-1, and she will meet the winner between Tereza Martincova and Victoria Azarenka in the quarter-final.

Second and third seeds Paula Badosa and Ons Jabeur eased into the Silicon Valley Classic quarter-finals on Wednesday, while Simona Halep and Jessica Pegula were bundled out of the Citi Open.

Last month's Wimbledon finalist Jabeur proved too good for American Madison Keys 7-5 6-1, winning in one hour and 22 minutes.

Jabeur, playing for the first time since Wimbledon, converted six of nine break points for the match, dominating the second set where she won 90.9 per cent first serve points.

Second seed Badosa survived a scare to win over qualifier Elizabeth Mandlik 6-2 5-7 7-6 (7-5) in two hours and 31 minutes.

Eighth seed Karolina Pliskova was knocked out by American Amanda Anisimova 3-6 7-5 6-1, while last year's runner-up Daria Kasatkina beat Taylor Townsend 6-4 6-0.

Two-time major winner Halep was forced to retire due to illness and top seed Jessica Pegula was bundled out by Daria Saville at the Citi Open.

In warm conditions, the 30-year-old Romanian battled throughout the match but eventually retired down 7-5 2-0 to Anna Kalinskaya after one hour and six minutes.

Halep had fought back from a 4-0 deficit in the first set to square it up at 5-5, before losing the first set.

However, the former world number one succumbed to illness early in the second set, handing Kalinskaya her passage into the quarter-finals.

On a dramatic day for the Citi Open favourites, world number seven Pegula was eliminated by Saville in straight sets in one hour and 38 minutes, 7-5 6-4.

Pegula was not helped by a first-serve percentage of 44.8 per cent, while she struggled to convert break points, with the Australian saving nine of 10 for the match.

Saville's win means she is 3-3 against top 20 opponents this year, progressing into the last eight where she will face Canadian qualifier Rebecca Marino.

Marino, who beat Venus Williams in her return to singles in the first round on Monday, knocked off Germany's Andrea Petkovic 6-3 3-6 6-1.

Estonian sixth seed Kaia Kanepi progressed into the quarters where she will face Kalinskaya after beating China's Zhu Lin 4-6 6-4 6-4.

Second seed Hubert Hurkacz was a shock second-round casualty from the Citi Open on Wednesday after a straight-sets defeat to Emil Ruusuvuori.

World number 46 Ruusuvuori triumphed 6-4 7-6 (7-3) in one hour and 43 minutes to book a quarter-final spot.

Hurkacz, who is ranked 11th in the world and reached last year's Wimbledon semi-finals, fought hard but failed to capitalise on four break points throughout the match.

"He had an early break point, but then I was able to keep that service game and give myself a chance to break him and I was able to use it and then just try to keep my own serve," Ruusuvuori said.

"I just tried to hang in there and tried to stay as tough as [I] can."

Wimbledon runner-up Nick Kyrgios defeated 14th seed Tommy Paul 6-3 6-4 in one hour and 25 minutes.

The Australian hit 29-21 winners, with the majority coming from his serve and forehand, sending down 15 aces, winning 84 per cent on his first serve.

Kyrgios, who broke Paul in his opening service game, converted three of four break points for the match, while the American failed to capitalise on any of his four.

Sixth seed Denis Shapovalov was bundled out in the second round by American wildcard J.J. Wolf 6-2 6-7 (5-7) 6-3 in a major upset.

Third seed Taylor Fritz avoided an early exit with a 6-4 6-4 win over Australian Alexei Popyrin in one hour and 11 minutes, while fourth seed Reilly Opelka came from a set down to defeat Denis Kudla 6-7 (6-8) 6-4 6-4 in just over two hours. Opelka sent down 28 aces across the match.

Fifth seed Grigor Dimitrov got past Adrian Mannarino 6-1 3-6 7-5 and ninth seed Holger Rune brushed off Benoit Paire 6-3 6-2.

Francis Tiafoe defeated Christopher Eubanks 6-3 7-6 (7-2), while 13th seed Maxime Cressy fought back from an early deficit to get past Jack Sock 4-6 6-4 6-0 to set up a third-round clash with top seed Andrey Rublev.

There were defeats for 11th seed Alex de Minaur to Yoshihito Nishioka 3-6 7-6 (8-6) 6-2, 12th seed Sebastian Baez against Sebastian Korda 6-1 6-4 and 15th seed Aslan Karatsev against Andy Murray's first-round conqueror Mikael Ymer 6-4 3-6 6-4.

At the Los Cabos Open in Mexico, second seed Felix Auger-Aliassime had no troubles against local Juan Alejandro Hernandez Serrano, winning 6-3 7-5.

American sixth seed Brandon Nakashima also progressed into the quarter-finals with a 6-3 6-3 win over Max Purcell, while Miomir Kecmanovic beat Jordan Thompson 6-4 6-2.

Nick Kyrgios barely broke a sweat on his way to a 6-3 6-2 win against Marcos Giron in the opening round of the Washington Open, finishing the job in an even 60 minutes.

The talented Australian, who won the doubles title at last week's Atlanta Open with compatriot Thanasi Kokkinakis, showed off his imposing serve against Giron. He won the ace count 12-to-four, while converting 82 per cent (28-of-34) of his successful first serves into points.

Earlier in the day, Daniel Evans won an all-English showdown against Kyle Edmund 6-1 6-2, but fellow Englishman Jack Draper was not so lucky against Russia's Andrey Rublev, going down 6-4 6-2.

Winner of the singles title at the Atlanta Open, Jenson Brooksby could not keep his strong form going as he lost 6-4 6-3 to Yoshihito Nishioka. Mackenzie McDonald lost to Brooksby in Atlanta, and he was also bounced in the first round by Finland's Emil Ruusuvuori 1-6 6-4 6-4.

America's Chris Eubanks won a tough three-setter against France's Benjamin Bonzi 3-6 6-3 7-5, and Sebastian Korda passed the test of in-form Ilya Ivashka 6-4 7-6 (7-5).

Veteran Jack Sock got the better of Belgium's David Goffin 7-6 (7-4) 6-4, and the Netherlands' Botic van de Zandschulp fought off frisky Croatian Borna Gojo 7-6 (8-6) 6-7 (5-7) 6-4 to narrowly avoid an upset from a player ranked 170 spots lower.

Meanwhile, at the Los Cabos open in Mexico, Kokkinakis continued his march back up the rankings with a 6-3 6-7 (5-7) 6-2 win against Fernando Verdasco.

Kokkinakis will play American Steve Johnson in the second round after he collected a straight sets 7-6 (7-1) 6-4 win against Argentina's Gonzalo Villanueva.

Romania's Radu Albot defeated Spain's Feliciano Lopez 6-3 6-7 (6-8) 6-3 to book his place in the second round against Australian Jason Kubler, who won his 10th match from his past 12 fixtures to beat Tomas Martin Etcheverry 6-7 (4-7) 6-3 6-1.

The only Mexican in the draw, Alex Hernandez, made the most his wildcard to win his first tour-level match, defeating Nicolas Barrientos 3-6 6-4 6-4 to become the first Mexican player to win at Los Cabos.

Facundo Bagnis was the only of the three Argentines to make it through, with a 6-3 6-1 win over Ernesto Escobado, Brandon Nakashima defeated Kaichi Uchida 7-6 (7-1) 6-2, and Jordan Thompson rounded out the day's action with a comfortable 6-3 6-0 triumph over Yannick Hanfmann.

Naomi Osaka delivered a terrific third set to defeat China's Qinweng Zheng 6-4 3-6 6-1 in the opening round of the Silicon Valley Classic.

Osaka's serve was sharp and it carried her through the match, with 11 aces to Zheng's three, while giving up one break of serve and securing three breaks herself.

After Zheng fought back to win the second set, Osaka was the steady head in the decider, allowing her opponent to implode with three double-faults in crucial points to collect her first win since April.

Osaka will meet Cori Gauff in a star-studded second-round matchup after Gauff dominated Anhelina Kalinina 6-1 6-0.

She was simply too powerful for her Ukrainian opponent, winning 89 per cent (25-of-28) of her first serves to never give Kalinina a chance.

Canada's Bianca Andreescu was eliminated by American Shelby Rogers 6-4 6-2, while Russia's Veronika Kudermetova won a hard-fought battle against Italy's Camila Giorgi 7-6 (7-2) 4-6 7-5.

Meanwhile, in Washington at the Citi Open, Emma Raducanu looked in good touch as she handled the challenge of Louisa Chirico 6-4 6-2 to advance to the second round.

Raducanu will meet Colombia's Camila Osorio after she beat American Sofia Kenin 7-6 (7-2) 6-1, and top-20 talent Victoria Azarenka had no issues against Dayana Yastremska to win 6-4 6-0.

Australian Ajla Tomljanovic continued her strong run of form with a convincing 6-1 6-4 win against American Sloane Stephens, and the Czech Republic's Tereza Martincova recovered from a horrible first set to defeat Xinyu Wang 0-6 6-4 6-4.

Germany's Andrea Petkovic cruised to a 6-2 6-2 win against Denmark's Clara Tauson, and Russia's Anna Kalinskaya defeated American Madison Brengle 6-3 6-0.

Nick Kyrgios has announced via social media that he will not be featuring at this year's Laver Cup in London.

The Australian has played in all the previous four editions of the tournament, but has stated he will instead spend time with his family rather than represent Team World at the O2 Arena.

Wimbledon runner-up Kyrgios has not played a singles match since his defeat to Novak Djokovic in the final in SW19 on July 10.

He has been involved in doubles action, however, winning the doubles title at the Atlanta Open with playing partner Thanasi Kokkinakis.

Kyrgios' absence will be a big blow for Team World in London next month, which is due to be captained by John McEnroe.

In an Instagram story, Kyrgios said: "No Laver Cup for me this year!!! Just letting you all know. Gotta have that home time with my family and beautiful girlfriend."

Elena Rybakina has been bundled out of the first round of the Silicon Valley Classic by Daria Kasatkina in her first game since her Wimbledon triumph last month.

Rybakina won the first set comfortably before the Russian hit back for a remarkable turnaround win, 1-6 6-2 6-0 in one hour and 40 minutes.

Seventh seed Kasatkina was the runner-up at last year's Silicon Valley Classic and found her groove to break her Rybakina six times in the second and third sets.

Rybakina sent down three of her four aces for the match in the first set, but Kasatkina adjusted to her serve and won 52.1 per cent return points for the match.

Eighth seed Karolina Pliskova fought back from a slow start to get past Katie Boulter 1-6 7-6 (7-5) 6-3, despite 16 double faults.

American Amanda Anisimova overcame compatriot Ashlyn Krueger 6-2 7-6 (7-5). US pair Madison Keys and Taylor Townsend were also winners.

Third seed Simona Halep and top seed Jessica Pegula were both among the winners in the first round at the Citi Open in Washington DC.

Two-time major winner Halep cruised past Spanish qualifier Cristina Bucsa 6-3 7-5 in one hour and 20 minutes.

Halep, playing her first match since her Wimbledon semi-final loss to Rybakina, fired 19 winners but also 33 unforced errors.

Defending champion Pegula made light work of countrywoman Hailey Baptiste 6-2 6-2 in 73 minutes.

Pegula will face unseeded Australian Daria Saville, who won in three sets over Mirjam Bjorklund, while sixth seed Kaia Kanepi will meet China's Zhu Lin after both won on Monday.

Fifth seed Elise Mertens was a first-round casualty, going down 7-6 (7-4) 6-4 to Ludmilla Samsonova, while Croatian Donna Vekic knocked off seventh seed Mayar Sherif 6-4 6-1.

Six-time major champion Venus Williams played her first singles match in nearly a year but bowed out 4-6 6-1 6-4 to Rebecca Marino. 

Former world number one Andy Murray was left frustrated after physically fading on his way to a first-round exit at the Citi Open with a 7-6 (10-8) 4-6 6-1 loss to Mikael Ymer on Tuesday.

The three-time Grand Slam winner failed to convert four set points in the first set before the Swede triumphed in two hours and 50 minutes.

The match was full of momentum swings, with the 35-year-old capitalising on Ymer's own physical issues, appearing to cramp in the second set, to level it up after winning five of the final six games of the set.

But 23-year-old Ymer regained his composure and physical state to race away with the third set for victory, rounding out 37 winners for the match, leaving Murray frustrated.

"It was disappointing obviously," Murray told reporters. "I thought there was some good tennis in the first set. After that, both of us were struggling a bit physically. The level of the tennis was not great.

 "Obviously [I] had chances in the first set to close that out. I had set point at 6-5, then... three in the tie-break and didn't get it.

"I think he seemed like maybe he was cramping a little bit in the second set, but recovered absolutely fine after the break at the end of the [second] set.

"Went off to change and cool off a little bit, and he recovered well for the third, whereas I didn't really. Yeah, just frustrating."

The first-round exit comes after Murray lost in the Hall of Fame Open quarter-finals in Newport to Alexander Bublik when he cramped up in hot and humid conditions.

"Struggled a little bit the past two tournaments with that," he said. "I need to have a little look at that with my team and maybe see why that is, make a few changes."

French veteran Adrian Mannarino took care of Bradley Klahn 6-2 6-4, while Jack Draper beat Stefan Kozlov 7-5 6-2 to set up a second-round date with top seed Andrey Rublev.

World number 112 Benoit Paire also triumphed in the first round on Tuesday, getting past Peter Gojowczyk 7-5 6-4.

Kyle Edmund, Jack Draper, Borna Gojo, Dominik Koepfer, J.J Wolf and Denis Kudla also were victorious, with Alexei Popyrin progressing after a walkover against Wu Tung-lin.

Four-time major winner Naomi Osaka wants to simply get back to having fun upon her return to tennis at the Silicon Valley Classic this week.

The Japanese 24-year-old has not played since her first-round loss to Amanda Anisimova at the French Open in May and sits 41st in the world rankings. 

Osaka, who missed Wimbledon due to a left Achilles issue, parted ways with coach Wim Fissette last month after two and a half years.

The injury is one of many that have plagued Osaka over the past difficult 15 months, during which she withdrew from last year's French Open citing "mental health reasons" after boycotting her mandatory post-match media conferences.

She also announced a hiatus following her third-round US Open exit last year but appears in a better place now, with her father, Leonard Francois, stepping in as her coach.

"I just would like to have fun and I know I say that very often, basically every tournament for the last year now, but to genuinely have fun," Osaka told reporters.

"I was telling my dad literally this morning when we were practicing in the rain, years ago we would have to fight to practice on public courts. It was just me and my sister and my dad alone.

"Now I've gotten to the point where people pay to watch me play, and for that I am very grateful. I would have never imagined that as a child.

"Just having fun and being grateful in the moment and trying to engage with everyone to the best of my abilities."

Osaka moved to clarify there was nothing sinister behind her split with Fissette, having won the 2020 US Open and 2021 Australian Open titles alongside him.

"It was really good times with Wim and he's a really amazing coach," Osaka said.

"We didn't part on bad terms. I just felt I needed different energy, and at the same time, he's a very ambitious guy. I was getting injured and I'm sure he would have wanted to go to Wimbledon.

"It was two different mindsets, I would say. But he's a really cool guy still. So confirming that there were no bad things happening."

Osaka is due to face Qinwen Zheng in the first round at the Silicon Valley Classic on Tuesday.