Defending champions in the singles were Roger Federer in the men and Serena Williams in the women. In the men's doubles Bob Bryan and Mike Bryan were the defending champions , in the women's doubles Cara Black and Liezel Huber . Cara Black and Leander Paes were the defending champions in mixed . In a sense, this US Open was a tournament of surprise winners, or at least not the tournament of the defending champions. Although they made it to the final (and twice into the semi-finals) in three out of five competitions, none of them successfully defended the title. While the four seeded teams won the title in the women's and men's doubles, the unseeded US duo Carly Gullickson and Travis Parrott managed a real surprise coup. The bookmakers did not expect Kim Clijsters, who started with a wildcard, to crown her comeback on the WTA Tour with a major title. And last but not least, the victory of Juan Martin del Potros over the Swiss maestro Roger Federer in five sets and thus the first major title for the twenty-year-old Argentine.
Due to an interruption in the rain and the resulting postponement of the schedule, the men's final, like a year before, was not played until Monday. The rain showers, which have been returning since Thursday evening, had once again stimulated the discussion about the construction of a roof over Arthur Ashe Stadium. At the Australian Open and the Wimbledon Championships , the Center Courts are already equipped with a corresponding construction, at least a roof is planned for the Stade Roland Garros .