Sport: Tennis
Accolades: 31x Grand Slam champion (16 singles, 13 women's doubles, two mixed doubles), 6x No. 1 woman on the WTA tour (first time on July 8 ,2002), only female player to have won over $40 million in prize money, 3x WTA Tour Championships winner (2001, 2009, 2012), 4x Olympic gold medalist (2000, 2008, 2012 (singles and doubles)), WTA Player of the Year (2002, 2008-2009, 2012)

Thirty-one Grand Slam titles are enough to secure badass status on any list of athlete achievements, but Serena Williams is so much more than just a champion of the courts. Serena, along with her sister Venus, took the tennis world by storm upon their arrival. Making her pro debut in 1995 at just 14 years of age, Serena would go on to crack the top 10 by 1999. She is a pioneer for being the first African American woman to truly dominate a game that was for many years off-limits to African Americans and, aside from this year's blip at Wimbledon, she continues to improve upon her current No. 1 world ranking.