Tennis superstar Serena Williams on Wednesday appeared to reveal she is pregnant, posting a photo of herself in a bathing suit on Snapchat with the caption "20 weeks."

The 35-year-old, who will return to the No. 1 ranking in the world next week, later deleted the photo. Neither Williams nor her management team were immediately available for comment.

If Williams is indeed 20 weeks into her term, that would mean she was approximately two months pregnant when she captured her record 23rd Grand Slam tournament title at the Australian Open in January. Serena Williams has not played since, citing a knee injury.

Fans reacted with a mixture of awe and glee at the news.

"Serena Williams was pregnant when she won her 23rd grand slam tournament at the Australian Open. And did not drop ONE SET. Let that sink in," wrote Twitter user @noelleharmony on the social media site.

Williams, the highest-paid female athlete in the world, announced her engagement to Reddit co-founder Alexis Ohanian last December.