| Date: | July 18–25 |
| Edition: | 9th |
| Category: | Grand Prix (4 Star) |
| Prize Money: | $125,000 |
| Draw: | 64S / 32D |
| Surface: | Clay / outdoor |
| Location: | Washington, D.C., United Statesu |
| Champs: |  Guillermo Vilas[1] |
| Champd: |  John Alexander /  Phil Dent[2] |
| Main Name: | Washington Open (tennis) Washington Open |
The 1977 Washington Star International was a men's tennis tournament and was played on outdoor clay courts in Washington, D.C., USA. It was part of the 1977 Grand Prix circuit and categorized as a 4 star event. It was the 9th edition of the tournament and was held in Washington, D.C. from July 18 through July 25, 1977. First-seeded Guillermo Vilas won the singles title, his second after 1975, and earned the $20,000 first-prize money. The singles final was delayed for two hours due to rain.[3] [4]
Guillermo Vilas defeated Brian Gottfried 6–4, 7–5
John Alexander / Phil Dent defeated Fred McNair / Sherwood Stewart 7–5, 7–5