India's Leander Paes and his Czech partner Radek Stepanek have stormed into the semi-finals. In the Men's Doubles quarterfinals played late last night, the fourth seeded pair defeated the Pak-Dutch combination of Aisam-Ul-Haq Qureshi and Jean-Julien Rojer, 6-1, 6-7, 6-4. For a place in the finals, Paes and Stepanek will lock horns with America's top seeded Bryan brothers, Bob and Mike. Leander Paes is the lone Indian left in the Men's Doubles section. Meanwhile, World Number One American Serena Williams and La Ni of China have advanced to the Women's Singles semi-finals. In the quarterfinals. Serena brushed aside Spain's Carla Suarez Navarro, 6-0, 6-0, Li beat Russian Ekaterina Makarova, 6-4, 6-7, 6-2