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STUTTGART, GERMANY - APRIL 23: Agnieszka Radwanska of Poland plays a forehand in her semi final match against Laura Siegemund of Germany during Day 6 of the Porsche Tennis Grand Prix at Porsche-Arena on April 23, 2016 in Stuttgart, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

STUTTGART, GERMANY - APRIL 23:  Agnieszka Radwanska of Poland plays a forehand in her semi final match against Laura Siegemund of Germany during Day 6 of the Porsche Tennis Grand Prix at Porsche-Arena on April 23, 2016 in Stuttgart, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)