OUR STAFF REPORTER LAHORE Aisam-ul-haq Qureshi and his partner Rohan Bopanna conceded their doubles quarterfinal match to top seeds Mike and Bob Bryan due to an injury to the Indian Davis Cupper. The fifth seed Indo-Pak pair was locked 3-3 in the opening set with the formidable Americans but opted out of the contest when Bopanna developed some problem in his left ankle. Third seeds Leander Paes and Mahesh Bhupathi had earlier lost their second round clash 1-6, 6-7 (9) to Czech Tomas Berdych and Germany's Florian Mayer.