Two-time major champion Garbiñe Muguruza has announced her retirement from professional tennis at age 30.

Much like for so many other folks, Serena Williams’ last match at the U.S. Open was must-see TV for players still in the tournament, so Jessica Pegula and Petra Kvitova tuned in from their hotel rooms the night before their victories led off Saturday’s schedule and set up a fourth-round showdown.

Serena and Venus Williams do not appear on the women’s singles entry list released by Wimbledon.

Emma Raducanu beat Sloane Stephens 6-0, 2-6, 6-1 in a seesawing first-round match between U.S. Open champions.

At least Novak Djokovic knows who he'll face in the first round of his Australian Open title defense — if he’s allowed to play.

United States' Serena Williams falls during her fourth round match against Aryna Sabalenka of Belarus at the Australian Open tennis championship in Melbourne, Australia, Sunday, Feb. 14, 2021. (AP Photo/Hamish Blair)MELBOURNE – Serena Williams tumbled to the ground, her heavily taped right ankle turning, her body contorting, her racket flying. Grabbing the last two games, Williams pulled out 6-4, 2-6, 6-4 victory over No. Oh, my goodness.”Sabalenka — a 22-year-old from Belarus playing in only her second fourth-round Slam match — was visibly and audibly frustrated. Dominic Thiem — the Australian Open runner-up and U.S. Open champion in 2020 — looked physically compromised in a 6-4, 6-4, 6-0 loss to three-time major semifinalist Grigor Dimitrov.

AdHe said: “If it’s any other tournament than a Grand Slam, then I’d withdraw from that event, that’s for sure. Defending champion Novak Djokovic has started his fourth-round match against Milos Raonic at the Australian Open. He'll play either U.S. Open champion Dominic Thiem or Grigor Dimitrov next and he says he doesn't have a preference. Their match is to be followed by eight-time Australian Open champion Djokovic against 2016 Wimbledon finalist Milos Raonic — assuming Djokovic decides he can play. Other men in action include reigning U.S. Open champion Dominic Thiem and the man he beat in that final, Alexander Zverev.

Spain's Rafael Nadal reacts during his first round match against Serbia's Laslo Djere at the Australian Open tennis championship in Melbourne, Australia, Tuesday, Feb. 9, 2021. Daniil Medvedev extended his winning streak to 15 matches with a 6-2, 6-2, 6-4 win over Vasek Pospisil and seventh-seeded Andrey Rublev beat Yannick Hanfmann 6-3, 6-3, 6-4. 9 Matteo Berrettini defeated Kevin Anderson, a two-time finalist at majors, 7-6 (9), 7-5, 6-3. Barty lost to Sofia Kenin in the Australian Open semifinals last year and then skipped the U.S. Open and her title defense at the French Open because she stayed in Australia during the COVID-19 pandemic. AdTwo-time Australian Open quarterfinalist Tennys Sandgren also went through the hard lockdown.

3 Naomi Osaka, the U.S. Open champion. Two-time Australian Open champion Victoria Azarenka, Johanna Konta and Elina Svitolina are also in Kenin's quarter. Williams already has won seven Australian Open titles and her 23 major titles is a record in the Open era. In the top half, Djokovic’s bid for a third consecutive Australian title — and ninth overall — could get tricky. Djokovic and Zverev were playing against each other in an ATP Cup doubles match when the draw was made for the Australian Open.

United States' Serena Williams makes a forehand return to compatriot Danielle Collins during a tuneup event ahead of the Australian Open tennis championships in Melbourne, Australia, Friday, Feb. 5, 2021. (AP Photo/Andy Brownbill)MELBOURNE – Serena Williams withdrew from an Australian Open tuneup tournament citing a right shoulder injury on Friday within hours of setting up a semifinal match against top-ranked Ash Barty. Garbine Muguruza beat defending Australian Open champion Sofia Kenin 6-2, 6-2 to advance to the semifinals, reversing their result of their 2020 final at Melbourne Park. On either side of a delay on outside courts because of rain, former Wimbledon, U.S. Open and Australian champion Angelique Kerber beat No. 4 Borna Coric out in the quarterfinals after wins over Australian players earlier in the day.

Serbia's Novak Djokovic celebrates after defeating Canada's Denis Shapovalov in their ATP Cup match in Melbourne, Australia, Tuesday, Feb. 2, 2021. (AP Photo/Hamish Blair)MELBOURNE – Rafael Nadal didn't make it for Spain's ATP Cup opener because of a sore back, deciding it wasn't worth the risk a week ahead of the Australian Open. Nadal played more of a hand in that, with Djokovic limiting his time on court because of a blister. Back at Melbourne Park, where he has won a record eight Australian Open titles, he had plenty of energy to consume. Osaka, who won the U.S. Open last year and the Australian Open in 2019, will next face No.

(AP Photo/Alessandra Tarantino)PARIS – The Latest from the French Open (all times local):___11:10 p.m.Danielle Collins grabbed the last four games to come back and beat 2016 champion Garbiñe Muguruza 7-5, 2-6, 6-4 in the last third-round singles match at the French Open. Next up for Djokovic as he pursues a second French Open title and 18th Grand Slam trophy overall: No. ___4:20 p.m.Fifth-seeded Stefanos Tsitsipas reached the fourth round at the French Open for the second year in a row. He came through the qualifying tournament to reach the French Open main draw. ___1:10 p.m.Andrey Rublev advanced to the French Open fourth round with a 6-3, 6-2, 6-3 win against the unseeded South African Kevin Anderson.

(AP Photo/Christophe Ena)PARIS – The Latest from the French Open (all times local):____6:10 p.m.Former runner-up Sloane Stephens lost in the second round for her earliest exit at Roland Garros since a first-round defeat on her debut in 2011. ___4:15 p.m.Novak Djokovic's biggest concern seemed to be dealing with a rare bit of sunshine during his second-round victory at Roland Garros. ___2:30 p.m.Australian Open champion Sofia Kenin reached the third round at Roland Garros by beating Ana Bogdan 3-6, 6-3, 6-2. ____1:10 p.m.Danish teen Clara Tauson's surprise run is over after losing to American player Danielle Collins 6-2, 6-3 in the second round. Pliskova's twin sister, Kristyna, was also playing a former French Open champion when she faced 2016 winner Garbiñe Muguruza.