In US Open Tennis, the Indo-Russian pair of Leander Paes and Elena Vesnina will on Tuesday lock horns with the American duo of Jack Sock and Melanie Oudin in the semi-finals of the mixed doubles event. In the quarter-finals on Monday, the Paes-Vesnina pair defeated the Polish-Belarusian combine of Marcin Matkowski and Olga Govortsova in straight sets 6-2, 6-4 to make it to the last four stage.In the Men's Doubles competition, the fourth seeded Indian duo of Leander Paes-Mahesh Bhupathi and the Indo-Pak combine of Rohan Bopanna-Aisam-ul-Haq Qureshi, will also play their respective quarter-final matches on Monday.While Paes and Bhupathi will clash with the Polish pair of Marcin Matkowski and Mariusz Fyrstenberg, the fifth seeded Indo-Pak duo will take on the Britons, Colin Fleming and Ross Hutchins.