The US Open starts on the last Monday of August and continues for two weeks, with the middle weekend coinciding with the United States Labor Day holiday.

Since 1978, the tournament has been played on acrylic hardcourts at the USTA Billie Jean King National Tennis Center in Flushing Meadows–Corona Park, Queens, New York City.

Revenue from ticket sales, sponsorships, and television contracts is used to develop tennis in the United States.

That year, only clubs that were members of the United States National Lawn Tennis Association (USNLTA) were permitted to enter.

In 1915, the national championships was relocated to the West Side Tennis Club in Forest Hills, Queens, New York City.

The effort to relocate it to New York City began as early as 1911 when a group of tennis players, headed by New Yorker Karl Behr, started working on it.

They argued that most tennis clubs, players, and fans were located in the New York City area and that it would therefore be beneficial for the development of the sport to host the national championships there.

[16][17][18] In August 1915, the men's singles tournament was held at the West Side Tennis Club, Forest Hills in New York City for the first time, while the women's tournament was held at the Philadelphia Cricket Club in Chestnut Hill, Philadelphia (the women's singles event was not moved until 1921).

From 1917 to 1933, the men's doubles event was held at the Longwood Cricket Club in Chestnut Hill, Massachusetts.

Except for mixed doubles,[citation needed] all events at the 1968 national tournament were open to professionals.

In 1970, the US Open became the first Grand Slam tournament to use a tiebreaker to decide a set that reached a 6–6 score in games.

From 1970 through 1974, the US Open used a best-of-nine-point sudden-death tiebreaker before moving to the International Tennis Federation's (ITF) best-of-twelve points system.

[5] In 1973, the US Open became the first Grand Slam tournament to award equal prize money to men and women, with that year's singles champions, John Newcombe and Margaret Court, receiving $25,000 each.

[5] Since 1975, following complaints about the surface and its impact on the ball's bounce, the tournament has been played on clay courts instead of grass.

Jimmy Connors is the only individual to have won US Open singles titles on all three surfaces (grass, clay, and hardcourt), while Chris Evert is the only woman to have won US Open singles titles on two surfaces (clay and hardcourt).

While fan-friendly, the concept proved divisive among players because it gave them less than a day's rest between the semifinal and championship matches.

[32][29] In 2015, the US Open returned to a format similar to the other Grand Slams, with women's and men's finals on Saturday and Sunday, and players having an extra day of rest.

[44] The stadium is named after Arthur Ashe, who won the men's singles title at the inaugural US Open in 1968, and was inducted into the International Tennis Hall of Fame in 1985.

[52] In 2006, the US Open introduced instant replay reviews of line calls, using the Hawk-Eye computer system.

[citation needed] In 2018, all competition courts were outfitted with Hawk-Eye, and all matches in the main draws (Men's and Women's Singles and Doubles) followed the same procedure, whereby each player was allowed three incorrect challenges per set, with one more given in a tiebreak.

Player challenges were eliminated in 2021, when the tournament became the second Grand Slam to fully incorporate Hawk-Eye Live, where all line calls are made electronically; the previous year's tournament had also incorporated Hawk-Eye Live on all courts except for Arthur Ashe and Louis Armstrong stadiums to reduce personnel during the COVID-19 pandemic.

The prize money for the wheelchair draw amounts to a total of $1,366,800, plus additional expenses, such as per diem and direct hotel payments of $4,656,420.

Efforts were also undertaken to enhance support for participants across all events by implementing expanded player expense assistance measures.

This iteration of the tournament introduced substantial changes in player per diem allowances, extending to all competitors.

Additionally, an elevation in meal allowances and provision of racquet stringing services are also in effect for all participating players.