Leonardo Mayer of Argentina serves 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 serves 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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