Men- Juan Martin Del Potro defeated Roger Federer 3-6 7-6(5) 4-6 7-6(4) 6-2 despite winning only one more game than the Fed Express.
Women- Kim Clijsters defeated Caroline Wozniacki 7-5 6-3.
Kim Clijsters
Juan Martin Del Potro.
Juan Martin Del Potro
Juan Martin Del Potro
Kim Clijsters
Men - Juan Martin Del PotroWomen - Kim Clijsters
Kim clijsters from Belgium is the reigning US Open women's singles champion, having retained the title she won in 2009 having just come out of retirement.
The matches have yet to be played for 2009. If you are asking about the 2008 singles champion, that would be Roger Federer and Serena Williams.
Lucas Glover won the 2009 US Open.
The final match was played between Caroline Wozniacki and Kim Clijsters. Kim Clijsters won the match. This was Kim Clijsters' second US Open Singles title.
Steffi Graf
Mary Pierce