Argentina's Leonardo Mayer returns the ball to Spain's David Ferrer during their final match at the tennis tournament in Hamburg, Germany, Sunday, July 20, 2014. Mayer defeated top seeded Ferrer with 6-7, 6-1 and 7-6. (AP Photo/dpa, Daniel Reinhardt)

Germany Tennis Hamburg

Argentina's Leonardo Mayer returns the ball to Spain's David Ferrer during their final match at the tennis tournament in Hamburg, Germany, Sunday, July 20, 2014. Mayer defeated top seeded Ferrer with 6-7, 6-1 and 7-6. (AP Photo/dpa, Daniel Reinhardt)

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