Leander Paes and Sania Mirza, with their team-mates, advanced into the Quartefinals of the China Open Tennis Tournament in Beijing today. In the Men's Doubles first round, the top seeded Indo-Canadian duo of Leander Paes and Daniel Nestor slammed the American team of John Isner and Sam Querrey in straight sets of 6-2, 6-2. In their Quarter final match they will be playing against the Spainish Duo of Fernando Verdasco and David Marrero.In the Women's Doubles, the Indo-Zimbabwean pair of Sania Mirza and Cara Black advanced into the quarter finals of the China Open Tennis Tournament. The Indo-Zimbabwe pair over came the Czech-Russian combination of Lucie Safarova and Anastasia Pavlyuchenkova in straight sets of 6-3, 6-2. They will now play against the Taipei-Chinese pasir of Y Chan and Jie ZhangYesterday, Mahesh Bhupathi and his Swedish partner Robert Lindstedt made an early exit from the tournament, after losing to the Serbian-Swiss team of Novak Djokovic and Stanislas Wawrinka, 3-6, 3-6. They will noe face Jie Zheng.India's only challenge in the Singles, Somdev Devvarman, yesterday bowed out of the competition. He lost to Spaniard Fernando Verdasco, 6-7, 3-6 in the opening round. World Number One Serbia's Novak Djokovic and Spaniards Rafael Nadal and David Ferrer advanced to the second round.