By surface
| Surface | Onny Parun | Thomaz Koch |
|---|---|---|
| Hard | 0 | 1 |
All meetings (3)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1973-03-05 | ATP | San Juan | Round Robin | Hard | Thomaz Koch | 6-7 | 5-7 | |||
| 1972-02-28 | ATP | New York | Round of 32 | — | Onny Parun | 7-5 | 6-3 | |||
| 1972-02-06 | ATP | Des Moines | Round of 16 | — | Thomaz Koch | 4-6 | 1-6 |