World number one Novak Djokovic made a shock early exit from the Wimbledon Tennis Championships in London. In the third round, 28th seed Sam Querrey of the United States stunned Djokovic with a 7-6, 6-1, 3-6, 7-6 victory, ending the 3-time winner and defending champion's hopes of a calendar-year Grand Slam.World number 10 Petra Kvitova also crashed out after losing to Ekaterina Makarova, 5-7, 6-7.World number two Andy Murray, Simona Halep, Kei Nishikori and Angelique Kerber were among those who advanced to the last-16.World number one Serena Williams, Roberta Vinci, Tomas Berdych and Jo-Wilfried Tsonga include those who will be seen in action in the Singles third round today.In Women's Doubles, the world number one pair of Sania Mirza and Martina Hingis entered the second round last night. They defeated Germans, Anna-Lena Friedsam and Laura Siegemund, 6-2, 7-5.In Men's Doubles, Rohan Bopanna and his Romanian team-mate Florin Mergea progressed to the pre-quarterfinals.Sania and Martina, and Leander Paes and his Pole partner Marcin Matkowski will play their second round matches today.