The WTA has backed up Serena Williams' claim of sexism in the way she was treated by umpire Carlos Ramos during the US Open final. Williams was warned for coaching, then docked a point for smashing a racket before Ramos penalised her a game after she called him a liar and a thief. That left the 23-time Grand Slam singles champion one game from defeat and in tears, with Naomi Osaka clinching her first slam title shortly afterwards.

The American has received a lot of support from current and former players, and on Sunday night, moments after Novak Djokovic won the men's title, WTA chief executive Steve Simon released a statement. Simon said: "Yesterday's US Open final resulted in the crowning of a deserving new champion, Naomi Osaka. The WTA applauds Naomi for her tremendous accomplishment.