1977 US Open – Mixed doubles
| Mixed doubles | |
|---|---|
| 1977 US Open | |
| Champions | Frew McMillan Betty Stöve |
| Runners-up | Vitas Gerulaitis Billie Jean King |
| Score | 6–2, 3–6, 6–3 |
Phil Dent and Billie Jean King were the defending champions but only Billie Jean King competed that year with Vitas Gerulaitis. Vitas Gerulaitis and Billie Jean King lost in the final 6–2, 3–6, 6–3 against Frew McMillan and Betty Stöve.