That was less than five months ago so we must assume that Williams knew she was pregnant at the time of her engagement announcement.
Serena Williams posted - and then deleted - a photo indicating she was 20 weeks pregnant yesterday and fans were wondering if she was really expecting with her fiance Alexis Ohanian.
She posted the picture on Snapchat of her wearing a yellow one-piece swimsuit with the caption "20 weeks".
The victory during her first trimester returned her to world No 1 and she also became the oldest grand slam victor in the open era.
"I'm happy to confirm Serena is expecting a baby this fall", Los Angeles-based publicist Kelly Bush Novak said.
And US OpenTennis responded: "Serena Williams will have a new pride and joy to hug and call her own soon!"
The news was later confirmed by one of Serena's representatives.
In the space of two years, Konta has gone from world number 151 to breaking the top 10, with her sights already set on the very top.
She has not played since that victory, citing a knee injury.
There is recent precedent for tennis players to return to action after becoming a mother.
Serena Williams of the US after beating Johanna Larsson of Sweden on day six of the 2016 U.S. Open tennis tournament at USTA Billie Jean King National Tennis Center.
I wrote my article, enraged that another prominent Black woman would decide to marry outside of her race, passing her generational wealth into the hands of another culture, on December 30, 2016. "We didn't have that", she said.
If Williams is 20 weeks pregnant, she would be due in early September. Kim Clijsters of Belgium retired and had a child before coming back at age 26 and winning three Grand Slam titles as a mother.
However, Kerber can regain the world number one ranking that week in Stuttgart. "It'll depend on her", Court said.
The younger Williams sister has won 23 Grand Slams, is just one short of Margaret Court, who collected many of hers in an era when the difficulties of worldwide travel often diluted the fields.
Seren-ity What is Serena Williams' net worth and how much has she won in prize money during her career? Victoria Azarenka, a former No. 1 and major champion, has announced she will be getting back on tour after having a baby a year ago.
Sister Venus, 36, has won seven Grand Slam singles titles.