The 2008 US Open was a tennis tournament played on outdoor hard courts. It was the 128th edition of the US Open, and the fourth and final Grand Slam event of the year. It took place at the USTA Billie Jean King National Tennis Center in Flushing Meadows, New York City, United States, from August 25 through September 8, 2008.
The men's defending champion, Roger Federer, won the US Open for a fifth consecutive time. Justine Henin, the women's defending champion, did not return to defend her title due to her retirement from tennis, for personal reasons, earlier in the year.Serena Williams was the champion on the women's side, winning her third US Open title; she had last won the event in 2002. Federer and Williams's opponents, Andy Murray and Jelena Janković, were making their débuts in Grand Slam finals. World number ones Rafael Nadal and Ana Ivanović went out in the semifinal and second round, respectively. This was Nadal's best ever result at the US Open.