By surface
| Surface | Onny Parun | Jeff Simpson |
|---|---|---|
| Grass | 2 | 0 |
All meetings (2)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1975-01-12 | ATP | Auckland | Semifinal | Grass | Onny Parun | 6-3 | 6-3 | 6-3 | ||
| 1973-08-29 | ATP | US Open | Round of 32 | Grass | Onny Parun | 3-6 | 6-3 | 7-6 | 6-1 |