By surface
| Surface | Onny Parun | William Alvarez |
|---|---|---|
| Clay | 0 | 1 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1970-03-16 | ATP | Barranquilla | Round of 64 | Clay | William Alvarez | 1-6 | 1-6 |
| Surface | Onny Parun | William Alvarez |
|---|---|---|
| Clay | 0 | 1 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1970-03-16 | ATP | Barranquilla | Round of 64 | Clay | William Alvarez | 1-6 | 1-6 |