Leander Paes of India and his Swiss partner Martina Hingis will face Americans Bethanie Mattek-Sands and Sam Querrey for the mixed doubles title of the US Open Tennis Championship tonight.In the men's semi-finals top seed Novak Djokovic of Serbia faces defending champion Marin Cilic of the United States, while second seed Roger Federer takes on his fellow Swiss Stan Wawrinka in the other semi final match. In the women's singles Serena Williams of the United States will continue her pursuit of a calendar Grand Slam tonight after the women's semi-finals at were postponed last night.Her challenger is Roberta Vinci of Italy. Second seed Simona Halep of Romania meets Flavia Pennetta of Italy in the other semi final.