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From Tiger Woods to Bill Clinton: Celebrities Cheer On Serena Williams at US Open

Serena Williams prepares to serve against Anett Kontaveit on Aug. 31.

Serena Williams prepares to serve against Anett Kontaveit on Aug. 31.

Photographer: Al Bello/Getty Images

As one of the greatest tennis players of all time advances to the third round of the US Open, celebrities and sports icons are cheering her on.

Retiring at the end of this tournament to pursue her passion for investing in startups, Serena Williams is on the path to tie the record for most Grand Slam titles ever. She already holds the record for winning the most majors in the Open era.