Serena Williams in Balenciaga for Vogue (along with daughter, Olympia).Photo: Luis Alberto Rodriguez/VogueOn Tuesday, Vogue announced Serena Williams as the cover star of its September 2022 issue. The tennis superstar appears in a striking blue Balenciaga gown, with a fold-out of the horizontal shot revealing her daughter, Olympia, posing along with her, clinging to the train, on the beach. (Adorable.) But Williams took the opportunity in the magazine's pages for an announcement of her own: Via a first-person story (as told to Rob Haskell), she revealed that she will be preparing to retire from professional tennis, calling the choice "the hardest thing that I could ever imagine.