1977 Mutual Benefit Life Open
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| 1977 South Orange Open | |
|---|---|
| Date | July 31 – August 8 |
| Edition | 8th |
| Category | Grand Prix (Two Star) |
| Draw | 32S/16D |
| Prize money | $75,000 |
| Surface | Clay / Outdoor |
| Location | South Orange, USA |
| Venue | Orange Lawn Tennis Club |
| Champions | |
| Singles | |
 Guillermo Vilas [1] |
|
| Doubles | |
 Colin Dibley /  Wojciech Fibak [2] |
|
The 1977 Mutual Benefit Life Open, also known as the South Orange Open, was a men's tennis tournament played on outdoor clay courts at the Orange Lawn Tennis Club in South Orange, New Jersey, USA. It was classified as a Two Star category tournament and was part of the 1977 Grand Prix circuit. It was the eight edition of the tournament on the Grand Prix circuit and was held from July 31 through August 8, 1977. First-seeded Guillermo Vilas won the singles title.[3][4]
Champions
Singles
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Guillermo Vilas defeated 
Roscoe Tanner 6–4, 6–1
Doubles
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Colin Dibley / Wojciech Fibak defeated 
Ion Țiriac / Guillermo Vilas 6–1, 7–5
