Since 1987, the US Open has been chronologically the fourth and final Grand Slam tournament of the year. The other three, in chronological order, are the Australian Open, the French Open, and Wimbledon. The US Open starts on the last Monday of August and continues for two weeks, with the middle weekend coinciding with the U.S. Labor Day holiday.
The tournament consists of five primary championships: men's and women's singles, men's and women's doubles, and mixed doubles. The tournament also includes events for senior, junior, and wheelchair players. 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 chairperson of the US Open is Katrina Adams.[citation needed] Revenue from ticket sales, sponsorships, and television contracts are used to develop tennis in the United States.
The US Open is the only Grand Slam tournament that employs tiebreakers in every set of a singles match. For the other three Grand Slam events, a match that reaches 6–6 in the last possible set (the third for women and the fifth for men) continues until a player takes a two-game lead. As with the US Open, those events use tiebreakers to decide the other sets.
The US Open also is the only Grand Slam tournament with 16 qualifiers (instead of 12) in the women's singles draw.
According to wikipedia
