Every so often, a debate bubbles up around whether it makes sense for men to keep playing best-of-five-set matches at Wimbledon and other Grand Slam tournaments.

John Isner says he will retire from professional tennis after playing at the U.S. Open.

A lot can be expected from Alexander Zverev in 2022 if his performance this week is any indication.

Alexander Zverev has denied Novak Djokovic the chance to play for a big trophy for the second time this year.

Naomi Osaka made quick work of her first match in nearly two months.

Great Britain's two-time gold medalist Andy Murray and compatriot Joe Salisbury managed to overwhelm the second-seeded men's doubles team, France's Pierre-Hugues Herbert and Nicolas Mahut, in a straight sets victory.

Unseeded Barbora Krejcikova saved one match point to book a spot if the French Open final, where she will face Anastasia Pavlyuchenkova on Saturday.

Stefanos Tsitsipas of Greece drops his racquet as he wins and defeats Austria's Dominic Thiem in their ATP World Finals singles final tennis match at the O2 arena in London, Sunday, Nov. 17, 2019. (AP Photo/Kirsty Wigglesworth)LONDON – Three years after coming to the ATP Finals as a hitting partner to the top pros, Stefanos Tsitsipas is leaving the tournament as champion. Tsitsipas rallied to beat Dominic Thiem 6-7 (6), 6-2, 7-6 (4) on Sunday for the biggest title of his career, becoming the youngest champion at the season-ending event in 18 years. ”He's great for tennis, because he has a very attractive game style, one-handed backhand, comes in a lot,” Thiem said. ”That's why it's probably mentally the most brutal sport existing, because you can play such a great match and end up losing in the championship match,” Thiem said.