Venus and Serena Williams won their 10th Grand Slam doubles title together and their third this season.
The fourth-seeded Williams sisters, who have already won the Australian Open and Wimbledon doubles titles this year, defeated top seeds and number ones Cara Black and Liezel Huber 6-2 6-2 in the 2009 US Open final.
In singles, both Venus and Serena lost to eventual champion Kim Clijsters. Venus was upset in the fourth round, while Serena controversially exited the tournament in the semifinals.
