Novak Djokovic of Serbia celebrates after defeating Roger Federer of Switzerland during of their 2015 US Open Men's singles final match on Sunday. Jewel Samad/AFP/Getty Images hide caption

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Jewel Samad/AFP/Getty Images

Venus Williams hits a forehand during her first-round win over Kirsten Flipkens of Belgium Monday. Matthew Stockman/Getty Images hide caption

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Matthew Stockman/Getty Images

A man finds some shelter from the rain Thursday at the U.S. Open, which is being played at Merion Golf Club in Ardmore, Pa. Brendan Smialowski /AFP/Getty Images hide caption

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Brendan Smialowski /AFP/Getty Images

Tiger Woods during a practice round Wednesday at The Olympic Club in San Francisco. Ezra Shaw/Getty Images hide caption

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Ezra Shaw/Getty Images

David Greene talks with Christine Brennan

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Andy Roddick races across the court to return a volley at the 2009 U.S. Open. Roddick was the last U.S. Open men's singles champion from America — which was in 2003 Edwin Martinez1/flickr hide caption

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Edwin Martinez1/flickr