World number one Novak Djokovic has lifted the Men's Singles trophy of the US Open, the fourth and final Grand Slam of the season.In the summit clash played last night, the Serb defeated second seed Roger Federer, 6-4, 5-7, 6-4, 6-4, to bag his second US Open and 10th Grand Slam title overall.Djokovic, who will now end the year with three of the four tennis majors, denied Federer from bagging his 18th Grand Slam and becoming the first player in the Open Era to win six US Open titles.In Women's Doubles, top seeds Sania Mirza and Martina clinched their second straight Grand Slam title when they beat the Aussie-Kazakh team of Casey Dellacqua and Yaroslava Shvedova in straight sets, 6-3, 6-3. It was also the Indo-Swiss pair's 5th Doubles title of the year.President Pranab Mukherjee and Prime Minister Narendra Modi have congratulated Sania for the victory.