Mahesh Bhupathi and his Czech partner Pavel Vizner upstaged fourth seeds Leander Paes and Martin Damm to set up a semi-final clash with top seeds Bob and Mike Bryan in the $2.20 million Rogers Cup in Montreal, Canada. Bhupathi and Vizner, seeded eighth in the event, beat Paes and Damm 7-6 (7), 2-6, 10-8.Very little separated the two pairs in the thrilling encounter. Paes and Damm saved as many as seven break points but lost the first set in the tie-break. The fourth seeded Indo-Czech duo, however, stormed back into the match in the second set. But Bhupathi and Vizner recovered from the jolt and held their nerves to seal the issue in the third set.They now face the American Bryan brothers in the quarter final.Sania goes down in doubles: In Los Angeles, Sania Mirza and her American partner Bethanie Mattek crashed out of the $600,000 East West Bank Classic doubles event following a 6-7 (2), 4-6 quarter final loss to second-seeded Australian-Czech duo of Rennae Stubbs and Kveta Peschke in a match that lasted close to one and-a-half hours.