India's Leander Paes and his Czech Radek Stepanek will clash with America's top seeded Bryan brothers – Bob and Mike – in their third and final Group-B match of the ATP World Tour Finals in London today. AIR correspondent reports, the third seeded Indo-Czech pair, which has already qualified to the semi-finals, is all geared up to take on the top seeded Bryan brothers and would be eying to enter the semi-final round with 3 victories from as many games.Meanwhile, the Indian duo of Mahesh Bhupathi and Rohan Bopanna yesterday waltzed into the Men's Doubles semi-finals. The fifth seeded Indian duo had won one of its two Group-A matches and it needed to win its third and final league match to qualify for the last four stage. The pair did not disappoint, as it defeated the second seeded Belarusian-Canadian combination of Max Mirnyi and Daniel Nestor, 7-6, 6-7, 10-5, making it to the semi-finals.In the Men's Singles, Serbia's Novak Djokovic and Briton Andy Murray yesterday advanced to the semi-finals. In their third and final Group-A matches, While Djokovic defeated Tomas Berdych of the Czech Republic, 6-2, 7-6; Murray defeated Frenchman Jo-Wilfried Tsonga, 6-2, 7-6.Swiss Roger Federer will today take on Argentina's Juan Martin Del Potro, while Spaniard David Ferrer will meet Serbia's Janko Tipseravic in their third and final Group-B matches today. Federer has already made it to the Men's Singles semi-finals.