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Laura Siegemund Pictures
STUTTGART, GERMANY - APRIL 26: (EDITORS NOTE: Image has been converted to black and white.) Laura Siegemund of Germany serves the ball to CoCo Vanderweghe of the United States during day 4 of the Porsche Tennis Grand Prix at Porsche-Arena on April 26, 2018 in Stuttgart, Germany. (Photo by Alex Grimm/Getty Images)