Here is some trivia related to the annual US Tennis Open.
- The U.S. Open is officially called the United States Open tennis tournament.
- The US Open was known as the Patriotic Tournament in 1917 during World War I.
- The youngest player to ever win a match was Vincent Richards (1918), at the age of 15 years, 5 months, and 8 days.
- A five set women's final was played from 1887-1901.
- From 1884-1911 for men and from 1887-1918 for women, a challenge round system (in which the defending champion qualified for the following year's final) was used.
- The oldest champion was Bill Larned who was 38 years, 8 months, and 3 days when he won the last of his seven singles titles in 1911.
- U.S. Open was played on clay courts from 1975 to 1977.
- In 1968 and 1969 both Amateur and Open Championships were held.
- In 1970 the US Open was the first of the Grand Slam tournaments to introduce the tie-break at the end of a set. The US Open remains different from the other three Grand Slam tournaments in that there are final set tiebreaks.
- The youngest ladies Singles Champion was Tracy Austin (1979) who was 16 years, 8 months, and 28 days
- The youngest Mens Singles Champion was Pete Sampras (1990), who was aged 19 years, 0 months, 28 days.
- The longest match on record in the history of the U.S. Championships was on Sept. 12, 1992, in the men's singles semifinals between Stefan Edberg and Michael Chang, which took five hours and 26 minutes.
- In 2005, all US Open and US Open Series tennis courts were given blue inner courts and green outer courts to make it easier to see the ball.
- In 2006, the US Open became the first Grand Slam tournament to use Hawk-Eye to review umpire calls. (see info about Hawkeye for Tennis). It is now called the 'Chase Review'.
- The 2020 tournament was postponed until September because of the coronavirus pandemic, and the games were played without spectators
- In 2021, Britain's Emma Raducanu became the first qualifier in the Open era to win a tennis Grand Slam, and she did so without losing a single set throughout the tournament.
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