Serena Williams

The most decorated female tennis player of the Open Era, Serena Williams won 23 Grand Slam singles titles -- more than any other player in the Open Era -- and held the world number one ranking for 319 weeks across her career from 1999 to 2022. She won the Australian Open in 2017 while 8 weeks pregnant and is the only player, male or female, to win all four Grand Slams in the professional era on multiple occasions, completing a non-calendar Serena Slam twice.