In Wimbledon Tennis, defending champion Petra Kvitova has made a shock exit in the third round. At the Centre Court in London last night, the world number two and two-time winner was stunned by 28th placed former world number one Jelena Jankovic of Serbia, who came back from a set behind to win 6-3, 5-7, 4-6 and enter the pre-quarterfinals. World number 10 Angelique Kerber of Germany also crashed out. Fifth seed Caroline Wozniacki, however, advanced to the fourth round.In the Men Singles, world number two Roger Federer, Andy Murray and Tomas Berdych progressed to the pre-quarterfinals, with Jo-Wilfried Tsonga bowing out.