Serena Williams

Serena Williams's 23 Grand Slam singles titles stand as the most in the Open Era, a record that surpasses the 22 of Steffi Graf, ranked #3 on this list. She held the world No. 1 ranking for a record 319 consecutive weeks, a mark no other female tennis player has matched. This dominance produced a 72.5% win rate in Grand Slam finals, with 23 titles from 32 appearances. Her powerful baseline game and mental fortitude redefined women's tennis, making her the ultimate benchmark for longevity and consistency in a sport where she outperforms #2 in career major titles.