1970 US Open (tennis)
The 1970 US Open was a tennis tournament that took place on the outdoor grass courts at the West Side Tennis Club in Forest Hills, Queens, in New York City, 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.
| 1970 US Open | |
|---|---|
| Date | 2 September – 13 September |
| Edition | 90th |
| Category | Grand Slam (ITF) |
| Surface | Grass |
| Location | Forest Hills, Queens, United States |
| Venue | West Side Tennis Club |
| Attendance | 122,996 |
| Champions | |
| Men's singles | |
| Ken Rosewall | |
| Women's singles | |
| Margaret Court | |
| Men's doubles | |
| Pierre Barthès / Nikola Pilić | |
| Women's doubles | |
| Margaret Court / Judy Tegart-Dalton | |
| Mixed doubles | |
| Margaret Court / Marty Riessen | |
It was the first Grand Slam tournament in which the tiebreak was used to decide the set at a 6–6 score. The 1970 US Open was the first tournament to introduce a final set tie-break in a Grand Slam. It differed from the current tie-break scoring in that it was won by the first player to reach five points with a sudden death at 4-4. A red flag would be put up by the umpire's seat to draw fan attention to the tiebreaker in progress. Most players disapproved of the tiebreaker but the visitors loved it.