Serena Williams

She held the world number one ranking for 319 weeks from 1999 to 2022, and her 2017 Australian Open victory while 8 weeks pregnant underscores her unparalleled resilience. Williams 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. Her career prize money of $94.8 million is the highest in women's tennis history, reflecting both her dominance and marketability.