Germany's Angelique Kerber poses in the winner's prize, a Porsche 911 Carrera 4 GTS Cabriolet, after winning against Denmark's Caroline Wozniacki in the final of the WTA Tennis Grand Prix in Stuttgart, southwestern Germany, on April 26, 2015.  Kerber won the match 3-6, 6-1, 7-5.  AFP PHOTO / THOMAS KIENZLE        (Photo credit should read THOMAS KIENZLE/AFP/Getty Images)