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STUTTGART, GERMANY - APRIL 26: Maria Sharapova of Russia reacts in her match against Roberta Vinci of Italy during the Porsche Tennis Grand Prix at Porsche Arena in Stuttgart, Germany on April 26, 2017. (Photo by Daniel Kopatsch/Anadolu Agency/Getty Images)

STUTTGART, GERMANY - APRIL 26: Maria Sharapova of Russia reacts in her match against Roberta Vinci of Italy during the Porsche Tennis Grand Prix at Porsche Arena in Stuttgart, Germany on April 26, 2017. (Photo by Daniel Kopatsch/Anadolu Agency/Getty Images)