The United States Open Tennis Championships is a hard court tennis tournament. The tournament is the modern version of one of the oldest tennis championships in the world, the U.S. National Championship, for which men's singles was first played in 1881. Since 1987, the US Open has been chronologically the fourth and final tennis major comprising the Grand Slam each year; the other three, in chronological order, are the Australian Open, the French Open and Wimbledon.
The US Open is held annually, starting on the last Monday in August, and lasting for two weeks into September, with the middle weekend coinciding with Labor Day. The main tournament consists of five event championships: men's and women's singles, men's and women's doubles, and mixed doubles, with additional tournaments for senior, junior, and wheelchair players of tennis. Since 1978, the tournament has been played on acrylic hard courts at the USTA Billie Jean King National Tennis Center in Flushing Meadows–Corona Park, Queens, New York City. The US Open is owned and organized by the United States Tennis Association (USTA), a non-profit organization, and the current Chairperson of the US Open is Katrina Adams. Revenue from ticket sales, sponsorships, and television deals are used to promote the development of tennis in the United States.
The US Open is the only Grand Slam that employs tiebreakers in every set of a match. For the other three Grand Slam events, if a match goes to the last possible set (the third for women, fifth for men) and there is a 6–6 tie, the match continues until one player wins by two games, but the sets played before the last set always employ tiebreakers should a set reach 6–6. It is also the only Grand Slam where the women's draw has 16 qualifiers, not 12.