Leander Paes and Sania Mirza, with their team-mates, have advanced into the Quartefinals of the China Open Tennis Tournament in Beijing. 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 today. 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 bating the Czech-Russian combination of Lucie Safarova and Anastasia Pavlyuchenkova in straight set