Sloane Stephens, Tennis Player
Achieving a Grand Slam–winning the Australian Open, the French Open, the U.S. Open and Wimbledon all in the same year–is a lofty goal. The last player to do this was Steffi Graff back in 1988, and she is still the record holder thanks to 19-year old Sloane Stephens who defeated potential Grand Slam winner Serena Williams.
As the youngest player in the WTA (Women’s Tennis Association) Top 40, her list of endorsement deals already includes Under Armour, Johnson & Johnson, American Express, Head Racquets and Usana Health Sciences.
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