Head to head
1
Hard
1
1
Clay
2
Onny Parun's wins on the left · Gerald Battrick's on the right · bar lengths share one scale
All meetings (5)
| 1976 | Hamburg | Clay | R32 | Onny Parun | 6-3 6-7 6-1 |
| 1973 | Johannesburg WCT | Hard | QF | Onny Parun | 6-4 7-5 |
| 1972 | Los Angeles-1 | Hard | R32 | Gerald Battrick | 6-4 7-5 |
| 1971 | Jacksonville | Clay | QF | Gerald Battrick | 6-4 7-6 |
| 1969 | Charlotte | Clay | R32 | Gerald Battrick | 10-8 3-6 6-1 |
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.