Germany's Philipp Kohlschreiber twists his right ankle as he returns a shot to Leonardo Mayer of Argentina during their semi final match at the German Open tennis tournament in Hamburg, Germany, Saturday, July 19, 2014. Mayer won with 7-5 and 6-4. (AP Photo/dpa, Daniel Reinhardt)

Germany Tennis Hamburg

Germany's Philipp Kohlschreiber twists his right ankle as he returns a shot to Leonardo Mayer of Argentina during their semi final match at the German Open tennis tournament in Hamburg, Germany, Saturday, July 19, 2014. Mayer won with 7-5 and 6-4. (AP Photo/dpa, Daniel Reinhardt)

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