# 1970 US Open – Women's singles

Defending champion Margaret Court defeated Rosie Casals in the final, 6–2, 2–6, 6–1 to win the women's singles tennis title at the 1970 US Open. With the win, Court completed the Grand Slam, the first woman in the Open Era to do so in singles. It was her fourth US Open singles title and record 20th major singles title, surpassing Helen Wills Moody's all-time tally.

## Seeds

* Margaret Court (champion)
* Rosie Casals (final)
* Nancy Richey (semifinals)
* Françoise Dürr (quarterfinals)
* Virginia Wade (semifinals)
* Kerry Melville (quarterfinals)
* Karen Krantzcke (withdrew before the tournament began)
* Judy Dalton (third round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Margaret Court | 6 | 6 | | | | | | | | | | | |
| | Helen Gourlay | 2 | 2 | | | | | | | | | | | |
| | Helen Gourlay | 2 | 2 | | 1 | Margaret Court | 6 | 6 | | | | | | |
| | | | | | 3 | Nancy Richey | 1 | 3 | | | | | | |
| 3 | Nancy Richey | 6 | 6 | | 3 | Nancy Richey | 1 | 3 | | | | | | |
| | Lesley Hunt | 4 | 4 | | | | | | | | | | | |
| | Lesley Hunt | 4 | 4 | | | | | | | 1 | Margaret Court | 6 | 2 | 6 |
| | | | | | | | | | | 2 | Rosie Casals | 2 | 6 | 1 |
| 5 | Virginia Wade | 5 | 6 | 6 | | | | | | | | | | | 2 | Rosie Casals | 2 | 6 | 1 |
| 4 | Françoise Dürr | 7 | 4 | 0 | | | | | | | | | | |
| 4 | Françoise Dürr | 7 | 4 | 0 | 5 | Virginia Wade | 2 | 7 | 2 | | | | | |
| | | | | | 2 | Rosie Casals | 6 | 6 | 6 | | | | | |
| 6 | Kerry Melville | 4 | 6 | 4 | 2 | Rosie Casals | 6 | 6 | 6 | | | | | |
| 2 | Rosie Casals | 6 | 4 | 6 | | | | | | | | | | |

### Top half
#### Section 1

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 1 | M Court | 6 | 6 | | | | | | | | | | | | | | |
| | P Austin | 1 | 0 | | 1 | M Court | 6 | 6 | | | | | | | | | |
| | P Hogan | 7 | 3 | 6 | | P Hogan | 1 | 1 | | | | | | | | | |
| | J Newberry | 5 | 6 | 1 | | | | | | 1 | M Court | 6 | 6 | | | | |
| | T Faulkner | 6 | 5 | 6 | | | | | | | T Faulkner | 0 | 2 | | | | |
| | C Murakami | 2 | 7 | 4 | | T Faulkner | 6 | 6 | | | | | | | | | |
| | P Stewart | 6 | 2 | 0 | | M Gengler | 3 | 4 | | | | | | | | | |
| | M Gengler | 3 | 6 | 6 | | | | | | | | | | 1 | M Court | 6 | 6 |
| | M Cooper | 4 | 2 | | | | | | | | | | | | H Gourlay | 2 | 2 |
| | H Gourlay | 6 | 6 | | | H Gourlay | 6 | 7 | | | | | | | | | |
| | C Graebner | 6 | 6 | | | C Graebner | 3 | 5 | | | | | | | | | |
| | L Tenney | 2 | 3 | | | | | | | | H Gourlay | 6 | 6 | | | | |
| | B-A Hansen | 5 | 4 | | | | | | | 8 | J Dalton | 4 | 2 | | | | |
| | K Pigeon | 7 | 6 | | | K Pigeon | 6 | 6 | 4 | | | | | | | | |
| | P Reese | 1 | 2 | | 8 | J Dalton | 7 | 0 | 6 | | | | | | | | |
| 8 | J Dalton | 6 | 6 | | | | | | | | | | | | | | |

#### Section 2

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 3 | N Richey | 6 | 6 | | | | | | | | | | | | | | |
| | L duPont | 2 | 3 | | 3 | N Richey | 6 | 6 | | | | | | | | | |
| | G Chanfreau | 6 | 3 | 6 | | G Chanfreau | 3 | 3 | | | | | | | | | |
| | D Carter | 3 | 6 | 3 | | | | | 3 | N Richey | 7 | 2 | 6 | | | | |
| | S Holdsworth | 1 | 5 | | | | | | | O Morozova | 5 | 6 | 2 | | | | |
| | S Johnson | 6 | 7 | | | S Johnson | 1 | 3 | | | | | | | | | |
| | L Liem | 7 | 4 | 1 | | O Morozova | 6 | 6 | | | | | | | | | |
| | O Morozova | 5 | 6 | 6 | | | | | | | | | | 3 | N Richey | 6 | 6 |
| | M Rodríguez | | | | | | | | | | | | | | L Hunt | 4 | 4 |
| | C Sandberg | w | / | o | | C Sandberg | 6 | 6 | | | | | | | | | |
| | ME Guzmán | | | | | C Capozzi | 2 | 2 | | | | | | | | | |
| | C Capozzi | w | / | o | | | | | | C Sandberg | 4 | 3 | | | | | |
| | L Hunt | 6 | 6 | | | | | | | L Hunt | 6 | 6 | | | | | |
| | K Kemmer | 3 | 1 | | | L Hunt | 6 | 6 | | | | | | | | | |
| | P Farmer | | | | | P Cody | 1 | 3 | | | | | | | | | |
| | P Cody | w | / | o | | | | | | | | | | | | | |

### Bottom half
#### Section 3

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 5 | V Wade | 6 | 6 | | | | | | | | | | | | | | | | |
| | T O'Shaughnessy | 1 | 1 | | 5 | V Wade | 7 | 6 | | | | | | | | | | | |
| | I Bentzer | 2 | 2 | | | P Bartkowicz | 6 | 1 | | | | | | | | | | | |
| | P Bartkowicz | 6 | 6 | | | | | | | 5 | V Wade | 6 | 6 | 6 | | | | | |
| | D Hard | 3 | 6 | 6 | | | | | | | S Walsh | 3 | 7 | 1 | | | | | |
| | V Ziegenfuss | 6 | 4 | 4 | | D Hard | 6 | 1 | 5 | | | | | | | | | | |
| | S Walsh | 6 | 4 | 6 | | S Walsh | 3 | 6 | 7 | | | | | | | | | | |
| | E Emmanuel | 1 | 6 | 2 | | | | | | | | | | | 5 | V Wade | 5 | 6 | 6 |
| | M Struthers | 4 | 6 | 2 | | | | | | | | | | | 4 | Dürr | 7 | 4 | 0 |
| | F Footman | 6 | 4 | 6 | | F Footman | 6 | 6 | | | | | | | | | | | |
| | J O'Hara | 6 | 6 | 6 | | J O'Hara | 7 | 7 | | | | | | | | | | | |
| | L Kaligis | 7 | 2 | 3 | | | | | | | J O'Hara | 1 | 1 | | | | | | |
| | N Truman | 6 | 6 | | | | | | | 4 | Dürr | 6 | 6 | | | | | | |
| | S Vinton | 2 | 0 | | | N Truman | 1 | 0 | | | | | | | | | | | |
| | M-A Curtis | 5 | 0 | | 4 | Dürr | 6 | 6 | | | | | | | | | | | |
| 4 | Dürr | 7 | 6 | | | | | | | | | | | | | | | | |

#### Section 4

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| 6 | K Melville | 6 | 6 | | | | | | | | | | | | | | |
| | B Vest | 2 | 2 | | 6 | K Melville | 6 | 7 | | | | | | | | | |
| | S Stap | 6 | 6 | | | S Stap | 4 | 5 | | | | | | | | | |
| | S Barman | 0 | 1 | | | | | | 6 | K Melville | 7 | 7 | | | | | |
| | L Tuero | 5 | 6 | 5 | | | | | | P Walkden | 6 | 5 | | | | | |
| | P Walkden | 7 | 3 | 7 | | P Walkden | 6 | 6 | | | | | | | | | |
| | E Pande | 6 | 6 | | | E Pande | 4 | 1 | | | | | | | | | |
| | C Molesworth | 4 | 3 | | | | | | | | | | 6 | K Melville | 4 | 6 | 4 |
| | P Teeguarden | 6 | 6 | | | | | | | | | | 2 | R Casals | 6 | 4 | 6 |
| | K Harris | 1 | 2 | | | P Teeguarden | 6 | 6 | | | | | | | | | |
| | G Hansen | 5 | 4 | | | K Harter | 1 | 4 | | | | | | | | | |
| | K Harter | 7 | 6 | | | | | | | P Teeguarden | 5 | 4 | | | | | |
| | M Kroschina | 3 | 4 | | | | | | 2 | R Casals | 7 | 6 | | | | | |
| | C Martinez | 6 | 6 | | | C Martinez | 0 | 3 | | | | | | | | | |
| | C Spinoza | 3 | 0 | | 2 | R Casals | 6 | 6 | | | | | | | | | |
| 2 | R Casals | 6 | 6 | | | | | | | | | | | | | | |