NEW DELHI (Agencies) Pakistans tennis ace Aisam-ul-Haq and his partner Indian Davis Cupper Rohan Bopanna advanced to the quarterfinals of Gerry Weber Open on Tuesday after defeating the pair of Ivan Dodig and Alexandr Dolgopolov in straight sets in the first round of the event at Halle, Germany. The "Indo-Pak Express", seeded top in the Euro 7,50,000 grass court tournament, defeated the duo of Dodig ( Croatia) and Dolgopolov ( Ukraine) 7-5, 6-4. In the quarterfinals, Bopanna and Qureshi will take on the combo of Dustin Brown of Germany and Gael Monfils of France, who beat Spanish duo of Pabio Andujar and David Marrero 6-0, 6-4 in another first round match.