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(170905) -- NEW YORK, Sept. 5, 2017 () -- Roger Federer (L) of Switzerland shakes hands with Philipp Kohlschreiber of Germany after their men's singles fourth round match at the 2017 U.S. Open in New York, the United States, Sept. 4, 2017. Roger Federer won 3-0. (/Wang Ying) (KEYSTONE/XINHUA/Wang Ying)