With a little Serena Williams or Alexis Ohanian on the way, the couple is now on the way to building their life together as a family.
It came with the caption "20 weeks", but was then deleted without explanation before official confirmation came several hours later. "I'm happy to confirm Serena is expecting a baby this fall", Williams' spokesperson told CNN in a statement.
Williams' Snapchat post, quickly highlighted in USA media, showed the 35-year-old in a yellow swimsuit that revealed an apparent baby bump.
Williams, who won the Australian Open in January, announced her engagement to Reddit co-founder Alexis Ohanian in December.
Williams' apparent announcement quickly became big news. Azarenka, 27, is planning to return to competition in late July after Wimbledon.
Another added: 'Serena Williams was pregnant when she won her 23rd grand slam tournament at the Australian Open. Court, an Australian, won the last three of those titles in 1973 after giving birth to a son, Danny, in 1972.
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The only other mothers to win slams in the Open era are Court's compatriot Evonne Goolagong and Belgian Kim Clijsters who were both 26 when they came back.
In pregnancy, a woman's center of gravity shifts forward to accommodate the growing fetus, which could affect Williams' stance. But lower prize money in tennis left her 40th in the overall standings.
Serena Williams has not played a tournament since that victory. Last month, the world No 2 pulled out of Indian Wells and Miami, citing a knee injury.
"We're losing one of the most powerful brands in the game for a while, but Maria Sharapova is about to return (from a drugs suspension)", he said. "You're part of that same age group, and once you've gotten over that mental hump of competing at this higher level in your 30s, which she obviously has, it is certainly possible".
The Women's Tennis Association, which has listed the 23-grand slam champion as scheduled to enter next month's Madrid Open, said they had yet to be contacted by anyone from the American's team regarding her status. With the current No. 1, Angelique Kerber, struggling, Williams will return to the top spot on Monday. With a light projection using a time frame similar to that of Azarenka, who is coming back this summer, Williams could be back on court around this time next season, though her already-light schedule makes any guesses even cloudier.