Spaniard Rafa Nadal said on Friday that he will end his 2021 season early due to a left foot issue that has been troubling him for a year, ruling him out of this month's U.S. Open.

An error-prone Naomi Osaka was stunned 3-6 6-3 6-3 by Jil Teichmann in the Western & Southern Open third round in Cincinnati on Thursday but the world number two said she had tried her best and would not lose any sleep over the defeat.

Naomi Osaka said she had felt "ungrateful" at times over the last year for not fully appreciating her life as one of the world's top tennis players.

Austria's Dominic Thiem will not defend his U.S. Open title after having to pull out of the hardcourt major with a wrist injury, the world number six said on Wednesday.

Former world number one Simona Halep says she is no longer afraid of COVID-19 after getting vaccinated and has called on others within the sport to get the vaccine to allow tennis to ease health and safety restrictions.

Naomi Osaka briefly left a press conference in Cincinnati on Monday after she appeared to get upset with a line of questioning about her relationship with the media, leading her agent to describe a reporter as a "bully".

Roger Federer will undergo another knee surgery after injuring it during the grasscourt season and will miss the U.S. Open given the rehabilitation process will rule him out of the sport for many months, he said on Sunday.

Novak Djokovic was beaten 1-6 6-3 6-1 by Germany's Alexander Zverev in the semi-finals of the men's singles at the Tokyo Games, dashing the Serbian's dream of winning his first singles gold medal and completing a Golden Slam.

Switzerland's Belinda Bencic became the first player to advance to the gold-medal match of the Olympics women's singles on Thursday, outlasting Kazakh Elena Rybakina 7-6(2), 4-6, 6-3 in a topsy-turvy semi-final.

Spain's Paula Badosa left the court in a wheelchair after retiring from her quarter-final match against Marketa Vondrousova with heatstroke in Tokyo on Wednesday.

Novak Djokovic will play Japan's Kei Nishikori in the quarter-finals of the Tokyo Olympics after the world number one breezed past Alejandro Davidovich Fokina in straight sets on Wednesday.

Daniil Medvedev struggled with the heat in Tokyo on Wednesday before battling through to the quarter-finals of the Olympics, staying on course for a heavyweight clash with Novak Djokovic.

Novak Djokovic eased into the third round of the Tokyo Olympics tennis tournament on Monday following a 6-4, 6-3 win over Germany's Jan-Lennard Struff.

Japan's Naomi Osaka sent out an ominous message to competitors at the Tokyo Games on Monday, sweeping past 50th-ranked Viktorija Golubic 6-3 6-2 to book a place in the third round.

Novak Djokovic launched his bid to stay on course for a Golden Slam with a clinical 6-2, 6-2 win over 139th-ranked Hugo Dellien of Bolivia on Saturday, as sweltering conditions in Tokyo took a toll on the players on the opening day of tennis at the Games.

The prospect of winning an Olympic gold medal for Serbia outweighs the disappointment of playing in an empty venue at the Tokyo games, the men's world tennis number one Novak Djokovic said on Monday.

For 97-year-old Leonid Stanislavskyi, a Ukrainian who has been playing amateur tennis for over half a century, it is next to impossible to find a worthy adversary in his age group.

Novak Djokovic said Sunday he considers himself the “best player” after winning a record-equalling 20th Grand Slam title but refuses to anoint himself as the “greatest of all time”.

The debate will rage on but Novak Djokovic believes he is the best player in the modern era after claiming a record-equalling 20th Grand Slam title by beating Italy's Matteo Berrettini in the Wimbledon final on Sunday.

Australian great Evonne Goolagong said Ash Barty’s Wimbledon win on Saturday made her more emotional than her own triumph at the grasscourt major 50 years ago.