STUTTGART, Germany :German top seed Alexander Zverev took out American third seed Ben Shelton with a 7-6(8) 7-6(1) victory in the semi-finals of the Stuttgart Open on Saturday to set up a showdown with Taylor Fritz. Zverev and Shelton tested each other in a high-quality encounter before the world number three played a near flawless tiebreak to clinch the match in little over two hours and stretch his career win-loss record over the American to 3-0. The 28-year-old banged down 15 aces, 35