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Juan Martin del Potro, of Argentina, reacts as fans cheer for him late in his match against Stan Wawrinka, of Switzerland, during the quarterfinals of the U.S. Open tennis tournament, early Thursday, Sept. 8, 2016, in New York. Wawrinka won 7-6 (5), 4-6, 6-3, 6-2. (AP Photo/Seth Wenig)