Serena Williams gave birth to her first child, a girl, at St. Mary’s Medical Center in West Palm Beach, Florida.
She entered the hospital on Wednesday, claimed an entire floor of the maternity wing and was induced on Thursday evening.
She and her fiancé, Reddit co-founder Alexis Ohanian became engaged in December 2016 at the Italian restaurant where they first meant.
Williams, 35, announced her pregnancy in a bathing suit snap on Snapchat in April with the caption “20 weeks.”
The athlete later revealed she had posted the snap publicly by accident, and that it was really only meant for close friends.
The 23-time major winner previously announced that she would be taking maternity leave for the remainder of 2017. She has said she hopes to return for the Australian Open in January.
Williams, the world’s highest paid female athlete, was about two months pregnant when she captured her 23rd grand slam singles title at the Australian Open, one short of the all-time record held by Australian Margaret Court.
Serena has not competed since winning the Australian Open in January but has posted several videos to social media showing her hitting balls during her pregnancy.
Other women have left the tour to have children and returned at a high level, although none has done so at Williams’ age.
Kim Clijsters of Belgium retired and had a child before coming back at age 26 and won three grand slam titles.
Australians Evonne Goolagong Cawley and Court also won grand slam titles after having children.