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1970 US Open (tennis)

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
Champions
Men's Singles
Australia Ken Rosewall
Women's Singles
Australia Margaret Court
Men's Doubles
France Pierre Barthes / Socialist Federal Republic of Yugoslavia Nikola Pilić
Women's Doubles
Australia Margaret Court / Australia Judy Tegart Dalton
Mixed Doubles
Australia Margaret Court / United States Marty Riessen
← 1969 · US Open · 1971 →

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 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.

Australia Ken Rosewall def. Australia Tony Roche, 2–6, 6–4, 7–6(7–2), 6–3

Australia Margaret Court defeated United States Rosemary Casals, 6–2, 2–6, 6–1


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