When was the first tennis major comprising the Grand Slam before the US Open first held?
US Open (tennis) The United States Open Tennis Championships is a hard court tennis tournament. The tournament 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, in chronological order, are the Australian Open, the French Open and Wimbledon.
1948 U.S. National Championships (tennis) The 1948 U.S. National Championships (now known as the US Open) was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club, Forest Hills in New York, United States. The tournament ran from 10 September until 19 September. It was the 68th staging of the U.S. National Championships, and the fourth Grand Slam tennis event of the year.