Indian duo of Mahesh Bhupathi and Rohan Bopanna will clash with Indo-Czech pair of Leander Paes and Radek Stepanek in the semifinals of Men's Doubles event at the Barclays ATP World Tour Tennis in London today.Paes and Stepanek last night defeated top seeds and three-time champions Bob and Mike Bryan of the United States 6-4, 6-7, 10-7, to top the Group A. The third seeded Indo-Czech pair, which has already qualified to the semi-finals remained unbeaten in the group stage, earning three victories from as many games. The No. 5 seeds Bhupathi and Bopanna, who finished second in Group B, entered the semi-finals defeating the second seeded Belarusian-Canadian combination of Max Mirnyi and Daniel Nestor earlier yesterday.