# 1978 US Open – Mixed doubles

Frew McMillan and Betty Stöve were the defending champions and successfully defended their title, defeating Billie Jean King and Ray Ruffels in the final, 6–3, 7–6.

## Seeds

* Frew McMillan / Betty Stöve (champions)
* Ray Ruffels / Billie Jean King (final)
* Bob Hewitt / Wendy Turnbull (semifinals)
* Chris Kachel / Ilana Kloss (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 |
| 2 | Ray Ruffels Billie Jean King | 6 | 6 | | | | | | | | | | |
| | Bob Carmichael JoAnne Russell | 0 | 1 | | | | | | | | | | |
| | Bob Carmichael JoAnne Russell | 0 | 1 | | 2 | Ray Ruffels Billie Jean King | 7 | 6 | | | | | |
| | | | | | | Stan Smith Anne Smith | 6 | 4 | | | | | |
| | Anand Amritraj Françoise Dürr | 6 | 7 | 3 | | Stan Smith Anne Smith | 6 | 4 | | | | | |
| | Stan Smith Anne Smith | 7 | 6 | 6 | | | | | | | | | |
| | Stan Smith Anne Smith | 7 | 6 | 6 | | | | | | 2 | Ray Ruffels Billie Jean King | 3 | 6 |
| | | | | | | | | | | 1 | Frew McMillan Betty Stöve | 6 | 7 |
| | Tom Leonard Pam Teeguarden | 7 | 4 | 3 | | | | | | | | | | 1 | Frew McMillan Betty Stöve | 6 | 7 |
| 3 | Bob Hewitt Wendy Turnbull | 6 | 6 | 6 | | | | | | | | | |
| 3 | Bob Hewitt Wendy Turnbull | 6 | 6 | 6 | 3 | Bob Hewitt Wendy Turnbull | 6 | 6 | 2 | | | | |
| | | | | | 1 | Frew McMillan Betty Stöve | 4 | 7 | 6 | | | | |
| | Chris Lewis Helena Anliot | 6 | 0 | 2 | 1 | Frew McMillan Betty Stöve | 4 | 7 | 6 | | | | |
| 1 | Frew McMillan Betty Stöve | 3 | 6 | 6 | | | | | | | | | |

### 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 |
| 2 | R Ruffels BJ King | 6 | 6 | 6 | | | | | | | | |
| | C Dowdeswell B Nagelsen | 4 | 7 | 3 | | | | | | | | |
| | | | | | 2 | R Ruffels BJ King | 7 | 6 | | | | |
| | | | | | | K Warwick R Maršíková | 6 | 3 | | | | |
| | P Rennert B Newfield | 5 | 2 | | | | | | | | | |
| | K Warwick R Maršíková | 7 | 6 | | | | | | | | | |
| | | | | | | | | | 2 | R Ruffels BJ King | 6 | 6 |
| | | | | | | | | | | B Carmichael J Russell | 0 | 1 |
| | B Carmichael J Russell | 6 | 6 | | | | | | | | | |
| | J Kriek B Cuypers | 4 | 2 | | | | | | | | | |
| | | | | | | B Carmichael J Russell | 6 | 7 | | | | |
| | | | | | | B Walts K Shaw | 4 | 5 | | | | |
| | B Walts K Shaw | w/o | | | | | | | | | | |
| | S Menon J Nachand | | | | | | | | | | | |

#### Section 2

| 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 |
| | | | | 4 | C Kachel I Kloss | 6 | 3 | 6 | | | | | | | | | |
| | | | | | V Winitsky R Fox | 2 | 6 | 2 | | | | | | | | | |
| | | | | | | | | | 4 | C Kachel I Kloss | 2 | 4 | | | | | |
| | | | | | | | | | | A Amritraj F Dürr | 6 | 6 | | | | | |
| | | | | | B Smith T Holladay | 1 | 3 | | | | | | | | | | |
| | | | | | A Amritraj F Dürr | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | A Amritraj F Dürr | 6 | 7 | 3 |
| A Amritraj A Kiyomura | 6 | 3 | 2 | | | | | | | | | | | S Smith A Smith | 7 | 6 | 6 |
| J McEnroe S Margolin | 4 | 6 | 6 | | J McEnroe S Margolin | 6 | 6 | | | | | | | | | | |
| J Van Linge G Glasgow | 6 | 6 | 6 | | J Van Linge G Glasgow | 3 | 4 | | | | | | | | | | |
| G Malin B Hallquist | 7 | 3 | 4 | | | | | | | J McEnroe S Margolin | 4 | 7 | 3 | | | | |
| R Reid K Reid | | | | | | | | | | S Smith A Smith | 6 | 6 | 6 | | | | |
| F Stolle J Anthony | w/o | | | | F Stolle J Anthony | 4 | 2 | | | | | | | | | | |
| S Smith A Smith | 6 | 7 | | | S Smith A Smith | 6 | 6 | | | | | | | | | | |
| J Whitlinger D Fromholtz | 3 | 6 | | | | | | | | | | | | | | | |

### Bottom half
#### Section 3

| 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 |
| J Marks R Tomanová | 6 | 7 | | | | | | | | | | | | | | | | |
| B Seewagen L Beaven | 3 | 6 | | | J Marks R Tomanová | 6 | 2 | 4 | | | | | | | | | | |
| T Leonard P Teeguarden | w/o | | | | T Leonard P Teeguarden | 2 | 6 | 6 | | | | | | | | | | |
| I Lendl H Strachoňová | | | | | | | | | | T Leonard P Teeguarden | w/o | | | | | | | |
| F McNair L Hunt | | | | | | | | | | D Crealy P Shriver | | | | | | | | |
| R Fagel C Casabianca | w/o | | | | R Fagel C Casabianca | 1 | 2 | | | | | | | | | | | |
| D Crealy P Shriver | 6 | 6 | 6 | | D Crealy P Shriver | 6 | 6 | | | | | | | | | | | |
| V Pecci V Ruzici | 7 | 2 | 1 | | | | | | | | | | | | T Leonard P Teeguarden | 7 | 4 | 3 |
| | | | | | | | | | | | | | | 3 | B Hewitt W Turnbull | 6 | 6 | 6 |
| | | | | | W Lloyd P Bostrom | | | | | | | | | | | | | |
| | | | | | S Denton B Jordan | w/o | | | | | | | | | | | | |
| | | | | | | | | | | S Denton B Jordan | 2 | 6 | 6 | | | | | |
| | | | | | | | | | 3 | B Hewitt W Turnbull | 6 | 4 | 7 | | | | | |
| | | | | | F González A Spex | | | | | | | | | | | | | |
| | | | | 3 | B Hewitt W Turnbull | w/o | | | | | | | | | | | | |

#### Section 4

| Second round | Second round | Second round | Second round | Second round | Third round | Third round | Third round | Third round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals |
| | C Lewis H Anliot | 6 | 6 | | | | | | | | | | |
| | R Drysdale K Ruddell | 2 | 2 | | | | | | | | | | |
| | | | | | | C Lewis H Anliot | 6 | 7 | | | | | |
| | | | | | | J Lucas R Richards | 2 | 6 | | | | | |
| | J Lucas R Richards | 6 | 2 | 6 | | | | | | | | | |
| | P Dent S Leo | 4 | 6 | 4 | | | | | | | | | |
| | | | | | | | | | | C Lewis H Anliot | 6 | 0 | 2 |
| | | | | | | | | | 1 | F McMillan Betty Stöve | 3 | 6 | 6 |
| | A Lucchesi M Louie | 6 | 6 | 7 | | | | | | | | | |
| | H Reid D Desfor | 2 | 7 | 6 | | | | | | | | | |
| | | | | | | A Lucchesi M Louie | 4 | 4 | | | | | |
| | | | | | 1 | F McMillan Betty Stöve | 6 | 6 | | | | | |
| | M Edmondson C O'Neil | 4 | 2 | | | | | | | | | | |
| 1 | F McMillan Betty Stöve | 6 | 6 | | | | | | | | | | |