Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Kim Clijsters was the two-time defending champion, but withdrew due to an abdominal injury. Ninth seed Samantha Stosur won her first Grand Slam championship, defeating the heavy favourite Serena Williams, a three-time US Open champion and the 28th seed, 6 2, 6 3 in the final. She became the first Australian woman to win the US Open since Margaret Court in 1973. The 2011 US Open was a tennis tournament played on the outdoor hard courts at the USTA Billie Jean King National Tennis Center in Flushing Meadows Park, of Queens, New York City, United States. It began on 29 August and was originally scheduled to end on 11 September, but was postponed to end on 12 September due to rain.