(Source: FameFlynet, Inset: ESPN)
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16. Serena Williams

ESPN Body Issue, 2010

In 2010, 28-year-old Serena Williams was the top female tennis player in the world with major wins at the Australian Open and Wimbledon. She also showed off her hard-earned physique when she appeared au natural on the cover of ESPN's Body Issue. Turns out strength really is beauty.