In the on-going US Open Tennis tournament being held in New York, the women's Doubles title will be decided today when the fifth seeded Czech pair of Andrea Hlavackova and Lucie Hradecka lock horns with the eighth seeded Aussie team of Ashleigh Barty and Casey Dellacqua.The Men's Singles semi-final matches of the US Open will also be played today. While, in the first semi-final, world number one Novak Djokovic of Serbia will clash with Swiss Stanislas Wawrinka, in the second semi-final, Spain's world number two Rafael Nadal will take on Frenchman Richard Gasquet. In the women's singles final tomorrow, world No.one, Serena Williams will clash with second seeded Victoria Azarenka of Belarus. Tomorrow's match will mark Serena's 21st Grand Slam final. The Mixed Doubles trophy of the US Open was bagged by the Belarusian-Czech combination of Max Mirnyi and Andrea Hlavackova.