Spaniard Rafael Nadal becomes the first man to win titles at the event on both clay and grass surface as he was crowned champion after defeating Serbian Viktor Troicki in the Single's final of the Stuttgart Open.The Spanish top seed defeated the Serb in straight sets of 7-6, 6-3. Nadal had claimed Stuttgart titles on clay in 2005 and 2007 and he won today at the newly established grass surface.