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

Germany Tennis Hamburg

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

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