The USTA Billie Jean King National Tennis Center is an American stadium complex located in the Flushing Meadows–Corona Park in Queens, New York City, which has been the home of the US Open Grand Slam tennis tournament played every year in August and September since 1978. It is operated by the United States Tennis Association (USTA). The facility has 22 courts inside its and 11 in the adjoining park. The complex's three stadia are among the largest tennis stadia in the world, with Arthur Ashe Stadium topping the global list with a listed capacity of 23,200. All 33 courts have used the DecoTurf cushioned acrylic surface since the facility was built in 1978.