However, what appears to be bigger than the rumored baby news is that Williams was most likely pregnant as far back as her first match at this year's Australia Open, which was in January. The most telling sign that the tennis player is indeed pregnant is her caption, which simply read "20 weeks", noted Buzzfeed. According to ESPN, in an email on Wednesday, a spokeswoman for Serena Williams confirmed that she is indeed expecting.
Serena's announcement has also earned her heaps of praise, as the fact that she's 20 weeks' pregnant means she was expecting when she won the Australian Open in January - impressive stuff.
"I'm elated for her; I've seen her with our son, and she will be a great mother", said Andy Roddick, a former men's world No. 1 who is a good friend of Williams and has known her since childhood.
"I'm happy to confirm Serena is expecting a baby this fall", Los Angeles-based Bush Novak said.
Just a few days ago she posted a photo of herself showing off her toned body and then another pic of her and her fiance Alexis Ohanian on the beach.
Tennis star Serena Williams could take a pass on Wimbledon if physical changes from her pregnancy such as balance and blood flow affect her preparation and performance, researchers who study pregnancy in high-performing athletes said.
Her victory over older sister Venus Williams broke a tie with Steffi Graf for the most major singles championships in the sport's open era. She won the NY marathon in November 2007 six weeks before turning 34 and 10 months after having a child. She has not competed since, citing a knee injury when withdrawing from tournaments at Indian Wells, California, and Key Biscayne, Florida.
Next Monday she is due to go back to number one, despite only having played two ranking tournaments outside the Grand Slams in the last twelve months, plus the Olympics.
She is second only to Australian Margaret Court on the list of women's all-time Grand Slam singles titles leaders.