The tennis star announced on Tuesday that she is now 20 weeks pregnant, with her baby due at the end of the summer.
According to ESPN, Williams (35) had posted a picture of herself wearing a yellow swimsuit with a caption reading "20 weeks" on Wednesday, which she later deleted.
Serena Williams is pregnant, this fantastic news was confirmed by the official representative for a tennis champion.
Pointing out that Court, fellow Australian great Evonne Goolagong Cawley and Belgian Kim Clijsters had returned from child birth to win grand slam titles, Williams' fans insist she can too.
Williams, the highest-paid female athlete in the world, announced her engagement to Reddit co-founder Alexis Ohanian in December.
The sports website further reported that Williams has not played any professional tennis following her Australian Open triumph.
She added that Williams will not play again this year but was looking forward to doing so in 2018.
Williams wouldn't be the first top women's player to return to competition after having a baby, but she would be the oldest. "From a size change difference, it might take longer for that to be an issue with her, depending on how she carries", said Pivarnik, who has studied the impact of pregnancy on exercise for the past three decades.
"Rather unbelievably there are no rules about physical activity - intense or otherwise - during pregnancy", says Maria McHale, health journalist and editor of Sláinte fitness magazine. "Congratulations Serena!" the US Tennis Association, organizers of the US Open, tweeted.
Williams has not played since winning her 23rd grand slam in Melbourne, withdrawing from the BNP Paribas Open at Indian Wells, California, and the Miami Open citing a knee injury.
Starting at about six months of pregnancy, a woman's balance shifts. Only one woman has won more: Margaret Smith Court, who claimed part of her 24 during the amateur era.
Opinions are already flying around as to when she'll return to the court.
Given her supreme physical fitness and competitive nature, her coach talked past year about Serena being capable of hitting the 30 Grand Slam mark.