The Men's Singles semi-final matches of the US Open Tennis tournament will be played at New York today. In the first semi-final, world number one Novak Djokovic of Serbia will clash with Swiss Stanislas Wawrinka, while in the second semi-final, Spain's world number two Rafael Nadal will take on Frenchman Richard Gasquet.Earlier, Swiss Roger Federer, in the pre-quartefinals, and Briton Andy Murray, in the quarterfinals, had made a shocking exit from this fourth and final Grand Slam of the season.In the Women's Singles, world number one American Serena Williams and world number two Victoria Azarenka of Belarus cruised into the finals last night. In the semis, Serena defeated China's Na Li, 6-0, 6-3, while Azarenka beat Italian Flavia Pennetta, 6-4, 6-2.The Mixed Doubles trophy was bagged by the Belarusian-Czech combination of Max Mirnyi and Andrea Hlavackova. In the title clash, the seventh seeded pair defeated the Mexican-American combination of Santiago Gonzalez and Abigail Spears, 7-6, 6-3.Meanwhile, the fifth seeded Czech pair of Andrea Hlavackova and Lucie Hradecka will lock horns with the eighth seeded Aussie team of Ashleigh Barty and Casey Dellacqua for the Women's Doubles title today.