The
United States Open Tennis Championships is a hardcourt
tennis tournament which 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 contested 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 are the
Australian Open,
French Open and
Wimbledon.