Head to head
Rivalry summary
Onny Parun and John Cooper met 2 times on the ATP tour between 1970 and 1970. Their head-to-head is level at 1–1. By surface, they are level 1–1 on grass.
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Grass
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Onny Parun's wins on the left · John Cooper's on the right · bar lengths share one scale
All meetings (2)
| 1970 | US Open | Grass | R64 | John Cooper | 6-4 7-5 7-6 |
| 1970 | Haverford | Grass | R32 | Onny Parun | 6-3 2-6 6-4 |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.