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STUTTGART, GERMANY - APRIL 21: Marina Melnikova of Russia hits a backhand during her first round match against Petra Martic of Croatia on day two of the Porsche Tennis Grand Prix at Porsche-Arena on April 21, 2015 in Stuttgart, Germany. (Photo by Daniel Kopatsch/Bongarts/Getty Images)

STUTTGART, GERMANY - APRIL 21: Marina Melnikova of Russia hits a backhand during her first round match against Petra Martic of Croatia on day two of the Porsche Tennis Grand Prix at Porsche-Arena on April 21, 2015 in Stuttgart, Germany.  (Photo by Daniel Kopatsch/Bongarts/Getty Images)