Five primary championships make up the US Open: men’s singles, women’s singles, men’s doubles, women’s doubles, and mixed doubles.
The singles events feature one player per side, while the doubles events feature same-gender teams. Mixed doubles pairs one man and one woman on each team. Together, these five championships form the tournament’s traditional core.
The US Open also stages additional competitions, including junior, senior, and wheelchair events. Those categories are why some descriptions may list more than five events, but they are not counted among the five primary championships in this standard breakdown.
The tournament’s oldest roots are in the U.S. National Championships, where men’s singles and men’s doubles were first contested in 1881. The US Open has been played on hard courts in Queens since 1978.