As of March 2021, who has won the most Grand Slam singles titles?
Serena Williams, (born September 26, 1981, Saginaw, Michigan, U.S.) is an American tennis player who revolutionized women’s tennis with her powerful style of play and who won more Grand Slam singles titles (23) than any other woman or man during the open era. (The first open tournament was the British Hard Courts at Bournemouth in April 1968).
Williams is widely regarded to be one of the greatest female tennis players of all time. She holds the most Grand Slam titles in singles, doubles, and mixed doubles combined among active players. Her 39 Grand Slam titles put her joint-third on the all-time list and second in the Open Era: 23 in singles, 14 in women's doubles, and two in mixed doubles. She is the most recent female player to have held all four Grand Slam singles titles simultaneously (2002–03 and 2014–15) and the third player to achieve this twice.
More Info:
www.britannica.com