NEW YORK - SEPTEMBER 5, 2016: Grand Slam champion Serena Williams of United States in action during her round four match at US Open 2016 at Billie Jean King National Tennis Center in New York
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NEW YORK - SEPTEMBER 5, 2016: Grand Slam champion Serena Williams of United States in action during her round four match at US Open 2016 at Billie Jean King National Tennis Center in New York