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STUTTGART, GERMANY - APRIL 25: Simona Halep of Romania reacts during her semi final match against Caroline Wozniacki of Denmark during Day 6 of the Porsche Tennis Grand Prix on April 25, 2015 in Stuttgart, Germany. (Photo by Dennis Grombkowski/Bongarts/Getty Images)

STUTTGART, GERMANY - APRIL 25:  Simona Halep of Romania reacts during her semi final match against Caroline Wozniacki of Denmark during Day 6 of the Porsche Tennis Grand Prix on April 25, 2015 in Stuttgart, Germany.  (Photo by Dennis Grombkowski/Bongarts/Getty Images)