1970 US Open – Mixed doubles
# 1970 US Open – Mixed doubles

Marty Riessen and Margaret Court were the defending champions and successfully defended their title, defeating Frew McMillan and Judy Dalton 6–4, 6–4 in the final.

## Seeds

* Marty Riessen / Margaret Court (champions)
* Alex Metreveli / Olga Morozova (second round)
* Frew McMillan / Judy Dalton (final)
* Dennis Ralston / Françoise Dürr (semifinals)

## 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | Marty Riessen Margaret Court | 7 | 3 | 6 | | | | | | | | | |
| | Tom Gorman Denise Carter | 5 | 6 | 2 | | | | | | | | | |
| | Tom Gorman Denise Carter | 5 | 6 | 2 | 1 | Marty Riessen Margaret Court | 6 | 6 | 6 | | | | |
| | | | | | 4 | Dennis Ralston Françoise Dürr | 3 | 7 | 3 | | | | |
| 4 | Dennis Ralston Françoise Dürr | 6 | 6 | | 4 | Dennis Ralston Françoise Dürr | 3 | 7 | 3 | | | | |
| | Bob Carmichael Gail Chanfreau | 3 | 1 | | | | | | | | | | |
| | Bob Carmichael Gail Chanfreau | 3 | 1 | | | | | | | 1 | Marty Riessen Margaret Court | 6 | 6 |
| | | | | | | | | | | 3 | Frew McMillan Judy Dalton | 4 | 4 |
| | Cliff Richey Nancy Richey | 1 | 3 | | | | | | | | | | | 3 | Frew McMillan Judy Dalton | 4 | 4 |
| 3 | Frew McMillan Judy Dalton | 6 | 6 | | | | | | | | | | |
| 3 | Frew McMillan Judy Dalton | 6 | 6 | | 3 | Frew McMillan Judy Dalton | 7 | 6 | | | | | |
| | | | | | | Roger Taylor Nell Truman | 5 | 3 | | | | | |
| | Owen Davidson Rosie Casals | 6 | 6 | | | Roger Taylor Nell Truman | 5 | 3 | | | | | |
| | Roger Taylor Nell Truman | 7 | 7 | | | | | | | | | | |

### Top half

**Section 1**

| Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| 1 | M Riessen M Court | 7 | 6 | | | | | | | | | | |
| | B Howe D Hard | 6 | 0 | | | | | | | | | | |
| | | | | | 1 | M Riessen M Court | 6 | 6 | | | | | |
| | | | | | | L Miller M-A Curtis | 2 | 2 | | | | | |
| | L Miller M-A Curtis | 6 | 6 | | | | | | | | | | |
| | G Taylor B-A Hansen | 3 | 4 | | | | | | | | | | |
| | | | | | | | | | 1 | M Riessen M Court | 7 | 3 | 6 |
| | | | | | | | | | | T Gorman D Carter | 5 | 6 | 2 |
| | P Guzmán E Emmanuel | 5 | 6 | 6 | | | | | | | | | |
| | O Bengtson C Sandberg | 7 | 3 | 4 | | | | | | | | | |
| | | | | | | P Guzmán E Emmanuel | 4 | 1 | | | | | |
| | | | | | | T Gorman D Carter | 6 | 6 | | | | | |
| | D Dell I Bentzer | 2 | 5 | | | | | | | | | | |
| | T Gorman D Carter | 6 | 7 | | | | | | | | | | |

**Section 2**

| 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| | | | 4 | D Ralston F Dürr | 6 | 3 | 7 | | | | | | | | |
| | | | | P Cornejo P Teeguarden | 3 | 6 | 5 | | | | | | | | |
| | | | | | | | | 4 | D Ralston F Dürr | 6 | 7 | | | | |
| | | | | | | | | | E Scott C Martinez | 2 | 6 | | | | |
| | | | | S Ross P Bartkowicz | 4 | 4 | | | | | | | | | |
| | | | | E Scott C Martinez | 6 | 6 | | | | | | | | | |
| | | | | | | | | | | | | 4 | D Ralston F Dürr | 6 | 6 |
| | | | | | | | | | | | | | B Carmichael G Chanfreau | 3 | 1 |
| | | | | B Carmichael G Chanfreau | 6 | 6 | | | | | | | | | |
| | | | | B Salembier P Hogan | 3 | 0 | | | | | | | | | |
| | | | | | | | | | B Carmichael G Chanfreau | w/o | | | | | |
| | | | | | | | | | D Crealy K Melville | | | | | | |
| | | | | R Ruffels V Wade | 3 | 7 | 6 | | | | | | | | |
| K Stuart K Harris | 2 | 3 | | D Crealy K Melville | 6 | 6 | 7 | | | | | | | | |
| D Crealy K Melville | 6 | 6 | | | | | | | | | | | | | |

### Bottom half

**Section 3**

| 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 |
| - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| J-B Chanfreau L Hunt | 6 | 6 | | | | | | | | | | | | | |
| V Korotkov M Kroschina | 2 | 3 | | J-B Chanfreau L Hunt | 4 | 6 | 5 | | | | | | | | |
| | | | | R Russell S Holdsworth | 6 | 3 | 7 | | | | | | | | |
| | | | | | | | | | R Russell S Holdsworth | | | | | | |
| | | | | | | | | | C Richey N Richey | w/o | | | | | |
| | | | | C Richey N Richey | 6 | 6 | | | | | | | | | |
| | | | | P Fishbach M Aschner | 2 | 4 | | | | | | | | | |
| | | | | | | | | | | | | | C Richey N Richey | 1 | 3 |
| | | | | | | | | | | | | 3 | F McMillan J Dalton | 6 | 6 |
| | | | | A Stone P Walkden | 6 | 7 | | | | | | | | | |
| | | | | A Olmedo K Kemmer | 2 | 6 | | | | | | | | | |
| | | | | | | | | | A Stone P Walkden | 3 | 5 | | | | |
| | | | | | | | | 3 | F McMillan J Dalton | 6 | 7 | | | | |
| | | | | M Machette S Walsh | 6 | 1 | 1 | | | | | | | | |
| | | | 3 | F McMillan J Dalton | 4 | 6 | 6 | | | | | | | | |

**Section 4**

| Second round | Second round | Second round | Second round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals |
| - | - | - | - | - | - | - | - | - | - |
| | F Stolle H Gourlay | 4 | 1 | | | | | | |
| | B Fairlie K Pigeon | 6 | 6 | | | | | | |
| | | | | B Fairlie K Pigeon | 2 | 6 | | | |
| | | | | O Davidson R Casals | 6 | 7 | | | |
| | O Davidson R Casals | 6 | 6 | | | | | | |
| | MA Ilahi P Stewart | 0 | 1 | | | | | | |
| | | | | | | | O Davidson R Casals | 6 | 6 |
| | | | | | | | R Taylor N Truman | 7 | 7 |
| | J Fillol K Harter | 7 | 6 | | | | | | |
| | P Curtis S Johnson | 6 | 4 | | | | | | |
| | | | | J Fillol K Harter | 5 | 4 | | | |
| | | | | R Taylor N Truman | 7 | 6 | | | |
| | R Taylor N Truman | 7 | 6 | | | | | | |
| 2 | A Metreveli O Morozova | 5 | 2 | | | | | | |
