<Tr> <Td> ← 2012 </Td> <Td> US Open </Td> <Td> 2014 → </Td> </Tr> <P> The 2013 US Open was a tennis tournament played on outdoor hard courts . It was the 133rd edition of the US Open, the fourth and final Grand Slam event of the year . It took place at the USTA Billie Jean King National Tennis Center, and ran from August 26 to September 9 . </P> <P> Andy Murray and Serena Williams were the defending champions in the singles events . Williams successfully defended her title, but Murray was defeated in the quarterfinals by Stanislas Wawrinka . Rafael Nadal won the men's singles . </P> <P> The 2013 US Open was the 133rd edition of the tournament and was held at USTA Billie Jean King National Tennis Center in New York City, United States . </P>

Who won the us womens open in 2013