Rohan Bopanna and his Pakistani partner Aisam-ul-Haq-Qureshi squandered one-set lead advantage against the top seeded pair of Daniel Nestor and Nenad Zimonjic to bow out of the $ 1,410,000 Barclays Dubai Open on Thursday.

The Indo-Pakistan combine lost to Canadian-Serbian duo 6-2, 6-7 (5), 6-10 in a thrilling quarterfinal encounter, which lasted one hour and 24 minutes.

Mahesh Bhupathi and his Bahamas partner Mark Knowles booked a quarterfinal berth after beating Jordan Kerr of Australia and Roger Wassen of the Netherlands 6-4, 6-3 in their first round clash on Wednesday.

The winners next take on formidable Spanish duo of Rafael Nadal and Feliciano Lopez, who beat South African pair of Jeff Coetzee and Wesley Moodie 6-4, 7-6(5).

Leander Paes had made a first-round exit from the tournament along with his Australian partner Paul Hanley.