1970 US Open (tennis) 1970 US Open (tennis) The 1970 US Open was a tennis tournament that took place on the outdoor grass courts at the Forest Hills, Queens in New York, United States. The tournament ran from 2 September until 13 September. It was the 90th staging of the US Open, and the fourth Grand Slam tennis event of 1970. It was the first Grand Slam tournament in which the tiebreak was used to decide the set at a 6-6 score. It differed from the current tie-break scoring in that it was won by the first player to reach five points with a
1970 Grand Prix (tennis) promoter and winner of the Wimbledon and US championships, and was aimed at countering the influence of commercial promoters, particularly Lamar Hunt and his World Championship Tennis circuit and George MacCall's National Tennis League. The tournaments were graded in one of three categories which determined the number of ranking points available: Class A, comprising the three Grand Slam tournaments, Class 1 and Class 2. The Pepsi-Cola Masters and Davis Cup Final are included in this calendar but did not count towards the Grand Prix. In addition to the tournament prize money a bonus pool of $150,000 was available for the