Spaniard Carlos Alcaraz has made it to the semi-finals on his Olympic Games debut.
Images from Day 9 of the 2021 US Open in New York on Wednesday.
A round-up of all the tennis action from around the globe.
Nadal will have the chance to claim the top spot back on Monday if he wins his third title in Acapulco
Roger Federer suffered one of his heaviest defeats at Wimbledon as he went down in straight sets to Poland's Hubert Hurkacz in the quarter-finals on Wednesday.
Matteo Berrettini won the Stuttgart Open for a second time after he beat Andy Murray 6-4, 5-7, 6-3 on Sunday to deny the Scot what would have been his first title on grass in six years.
Nadal believes he had no reason to feel alarmed ahead of the season's first Grand Slam starting in two weeks.
Images from Day 6 of Wimbledon at the All England Lawn Tennis and Croquet Club in London, on Saturday.
'My arm has been -- I have had an issue there for quite a while now. It has gotten bigger in the last couple of weeks, so I'm just trying to protect it.'
Earlier, title holder Borna Coric beat American Sebastian Korda 7-6 (5), 6-4, while another home hope Taylor Fritz survived a first-set thriller to beat Czech Jiri Lehecka 7-6 (14), 6-2.
Images from Day 6 of the 2021 US Open in New York on Saturday.
Daniil Medvedev has tapped into the energy of the crowd at Melbourne Park by playing both hero and villain.
Images from Day 3 of the French Open matches played at Roland Garros on Tuesday
IMAGES from Day 8 of the French Open at Roland Garros on Sunday.
Images from Day 9 of Wimbledon at the All England Lawn Tennis and Croquet Club in London, on Wednesday.
Spain's talisman Rafael Nadal sealed a sixth Davis Cup title for his country on Sunday when they beat Canada 2-0 in the final of the revamped event.
John McEnroe believes outside of Roger Federer, Rafael Nadal and Novak Djokovic, Nick Kyrgios elevates the game like few others.
Holder Stefanos Tsitsipas moved into the Monte Carlo Masters quarter-finals with a 7-5 7-6(1) victory over Laslo Djere
Raducanu retired from the match because of 'difficulty breathing'.
Despite being the king of Wimbledon, Federer has found himself in the same strict bubble as every other player in the draw this year, rather than in his usual plush rented house with his family a stroll away from the grounds.
Medvedev suffered a jarring early exit from the Canadian Masters last week but overcame some initial problems in a tricky tie against Shapovalov to edge both sets and book a meeting with American Fritz.
Greek second seed Stefanos Tsitsipas beat Chilean qualifier Cristian Garin to reach the fourth round of the Miami Open.
Not since Stan Wawrinka's 2016 US Open triumph has a Grand Slam been won by someone other than the 'Big Three', winners of the last 13 major titles.
Raonic advances, Sock ousted in Rogers Cup
Japan's Nishikori was the first man representing an Asian country to break through to a Grand Slam final at the 2014 tournament before Marin Cilic stopped him in the title match.
Novak Djokovic produced a stunning performance to thrash Frances Tiafoe in his first match since winning Wimbledon in July to edge Team Europe ahead in the Laver Cup on Saturday.
The 20-year-old, who reached the Australian Open last four and won titles on clay and indoor hard courts this year, has had a difficult time of it on grass.
Nadal has traditionally started his French Open campaigns with at least one claycourt title under his belt but this year got to the French capital empty-handed.
Nadal, who would pass fellow Spaniard Andres Gimeno as the oldest Roland Garros men's singles champion if he wins, had to dig deep again in a three-hour slugfest in the semi-final against Alexander Zverev before the German was forced to retire mid-match after injuring his ankle.
World number one Novak Djokovic extended his winning run in Asia when he strolled into the last-16 of the Shanghai Masters.
Australia's Nick Kyrgios has been fined a total of $17,500 for unsportsmanlike conduct by the ATP after a series of outbursts at officials at the Queen's Club championships on Thursday.
Top seed Alexander Zverev crashed out in the second round of the Stuttgart Open, losing to world number 170 Dustin Brown.
Top seed Simona Halep came back from a set down for the third time in the tournament to beat Kazakhstan's rising star Elena Rybakina 3-6, 6-3, 7-6(5) to win the Dubai Duty Free Tennis Championships for the second time on Saturday. In a battle that lasted nearly two-and-a-half hours, the match came down to a tiebreak where two shots that went agonisingly wide for Rybakina eventually decided the title in front of a noisy crowd that constantly chanted Halep's name.
Australia eased ahead of Bosnia 2-0 as John Millman thumped Damir Dzumhur 6-3, 6-2 while Alex de Minaur overcame Mirza Basic 6-3, 7-6(0), before Millman revealed the team's larger goal under captain Lleyton Hewitt.
Raducanu stormed into the third round of the Cincinnati Open
Nadal plays Berrettini in one semifinal, knowing he's potentially two match wins from a 21st major title.
"I think especially Rafa playing singles and doubles almost every day, he's been our MVP this week," Lopez said.
Pospisil and Shapovalov joined forces in the deciding doubles rubber against Jordan Thompson and John Peers, winning 6-4, 6-4 in front of several hundred delirious Canadian fans.
Rafael Nadal is the oldest title winner in the history of the clay-court tournament.
Laslo Djere won his first ATP title at the Rio Open on Sunday and then captured the hearts of the Brazilian crowd with a victory speech dedicated to his parents, both of whom died from cancer.