Cori Gauff: tennis’s age eligibility regulation is a rare piece of altruism in the world of professional sport.   Photograph:  Adrian Dennis/AFP/Gettty

Coco Gauff is one of the most enthralling figures in sport right now. The 15-year-old is certainly a branding godsend for tennis. Charismatic, brill(...)

 Serena Williams argues with chair umpire Carlos Ramos while playing Naomi Osaka of Japan during their  US Open women’s singles final match in New York. Photograph: Eduardo Munoz Alvarez/AFP/Getty

Serena Williams’s coach Patrick Mouratoglou expects on-court coaching to continue virtually unchecked at the Grand Slams despite the furore during las(...)

The prize money for the Australian Open at Melbourne Park has risen by 10 per cent. Photograph: Scott Barbour/Getty Images

Australian Open organisers are working to determine whether coaching will be allowed during the Grand Slam tournament in an effort to end the controve(...)

Serena Williams makes her case to Brian Earley and Donna Kelso during the US Open women’s singles final. Photo: Ben Solomon/The New York Times

The International Tennis Federation has backed umpire Carlos Ramos in the row over his handling of the US Open final, saying he acted with “profession(...)

Serena Williams argues with umpire Carlos Ramos during her women’s singles finals match against Naomi Osaka at the US Open. Photo: Jaime Lawson/Getty Images for USTA

In the middle of her United States Open final against Naomi Osaka at Arthur Ashe Stadium on Saturday, with a record-tying 24th Grand Slam singles titl(...)

Tennis player Serena Williams and fiance Reddit co-founder Alexis Ohanian have welcomed a baby girl. Photograph: Mike Coppola/Getty Images

Serena Williams has given birth to a baby girl, the first child for the former world number one tennis player, her coach Patrick Mouratoglou said on T(...)

 Serena Williams (R) of the USA holds her trophy after defeating her sister Venus Williams (L) in their women’s Singles final match at the Australian Open Grand Slam tennis tournament. Photograph: Made Nagi/EPA

Serena Williams was utterly unaware that a victory Saturday night would put her back at world No. 1. Her coach Patrick Mouratoglou did all he could t(...)

Novak Djokovic was knocked out of the men’s singles in Rio  by Juan Martín del Potro. Photograph: Afp

Novak Djokovic, the world’s dominant tennis player, had made the Olympic gold medal in singles one of his big priorities for 2016. He could not make (...)

Serena Williams of the U.S. hits a return to Kiki Bertens of the Netherlands during their second round match at the U.S. Open Championships tennis tournament in New York. Adrees Latif/Reuters

If this were a fight, it might have been called off before a blow had been landed. But Kiki Bertens, a smiling, 23-year-old Dutch qualifier who looked(...)

Serena Williams of the U.S. and Vitalia Diatchenko of Russia talk after Diatchenko retired from their match during the U.S. Open tennis tournament at Arthur Ashe Stadium in New York. Diatchenko appeared severely hobbled from the start, unable to move well, and retired in the second set. Photo: Todd Heisler/The New York Times

Serena Williams, as befits the grand dame of tennis, began the pursuit of a calendar grand slam with a regal swat on the first evening of the 2015 US (...)

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