Second-seeded Daniil Medvedev has lost in the first round of the French Open in five sets to an opponent who is ranked just 172nd and was playing only his second match in the main draw of any Grand Slam tournament.

Four-time major champion Naomi Osaka won the first match she’s played since May, beating Zheng Qinwen 6-4, 3-6, 6-1 on at the Mubadala Silicon Valley Classic.

The All England Club's strict guidelines about wearing white clothing are seen by some players as out-of-date rules.

Novak Djokovic’s play was not particularly perfect at Wimbledon.

The surprising results in the women's draw at the French Open keep piling up and now only three of the top 10 women's seeds are still in the field before the third round has even started.

Alizé Cornet has beaten 2017 champion Jelena Ostapenko 6-0, 1-6, 6-3 to advance to the third round at the French Open.

Making the quarterfinals at a tournament used to be no big deal for Naomi Osaka.

Two days, two wins and making it look easy.

U.S. singles players got two wins on Day 2 after all four singles entrants who played on Day 1 lost.

Four of the six American tennis players competing on day one of the tennis competition in Tokyo lost.

The Associated Press has learned that teenager Coco Gauff and Australian Open runner-up Jennifer Brady will lead the U.S. Olympic tennis team at the Tokyo Games.

Serena Williams is out of Wimbledon after she stopped playing her first-round match because of a right leg injury.

(AP Photo/Seth Wenig)NEW YORK The Latest on the U.S. Open tennis tournament (all times local):6:40 p.m.Unseeded Americans Ann Li and Shelby Rogers have pulled off upset victories in the second round of the U.S. Open. ___6:05 p.m.Top-seeded Karolina Pliskova has been upset in the second round of the U.S. Open by Caroline Garcia of France. It was the first time since 2008 that the top-seeded woman lost in the second round at the Open. Pliskova was a finalist at the Open in 2016 for the best Grand Slam result of her career. Seeking his fourth U.S. Open title, Djokovic lost a physical first set that took more than an hour.

Julian Finney/Getty Images(CNN) - Serena Williams reached her 12th Wimbledon semifinal with a gritty three-set victory against fellow American Alison Riske on Centre Court Tuesday. So just the keyword is getting fit and getting back into match play injury-free. But Riske's forehand was firing, and she broke Williams immediately, only for her compatriot to break again for 4-4. Williams had several breakpoints in a roller-coaster eighth game and eventually clinched the break when Riske double-faulted. Williams will also team up with two-time Wimbledon men's singles champion Andy Murray back out on Centre Court for their mixed doubles second-round match against Fabrice Martin and Raquel Atawo.

(CNN) - Women's world No.1 Ashleigh Barty couldn't maintain her French Open-winning form and crashed out of Wimbledon to American Alison Riske Monday. The shock result kicked off Wimbledon's blockbuster "Manic Monday" when all 32 remaining men's and women's singles players compete for a place in the quarterfinals. Cori "Coco" Gauff -- the 15-year-old sensation who has taken this grand slam by storm -- continues her remarkable fortnight but faces one of the pre-tournament favorites in Simona Halep, a former world No.1. First up on No.1, seven-time Wimbledon champion Serena Williams will face diminutive Spaniard Carla Suarez Navarro. 3 seed and former Wimbledon champion Petra Kvitova.