India's Leander Paes and his Czech partner Radek Stepanek will clash with the Spanish duo of Marcel Granollers and Marc Lopez in their second Men's Doubles Group-A match of the ATP World Tour Finals in London today. Third seeds Paes and Stepanek had won their opening group fixture and a victory today will ensure them a semi-final berth.Last night, the Indian duo of Mahesh Bhupathi and Rohan Bopanna won its must win Group-B match, keeping the hopes of a semi-final berth alive. The fifth seeded Indian pair defeated the Swedish-Romanian combination of Robert Lindstedt and Horia Tecau, 6-3, 5-7, 10-5. Bhupathi and Bopanna had lost their opening Group match and will now have to win their next and final league match to make it to the semis. They will take on the second seeded Belarusian-Canadian pair of Max Mirnyi and Daniel Nestor.