By surface
| Surface | Onny Parun | Heinz Gunthardt |
|---|---|---|
| Hard | 0 | 3 |
All meetings (3)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1980-08-26 | ATP | US Open | Round of 128 | Hard | Heinz Gunthardt | 4-6 | 2-6 | 3-6 | ||
| 1979-10-29 | ATP | Cologne | Round of 32 | Hard | Heinz Gunthardt | 2-6 | 2-6 | |||
| 1978-12-04 | ATP | Johannesburg | Round of 16 | Hard | Heinz Gunthardt | 1-6 | 3-6 |