Head to head
2
Hard
0
1
Grass
0
1
Carpet
0
Onny Parun's wins on the left · Syd Ball's on the right · bar lengths share one scale
All meetings (4)
| 1974 | Hong Kong | Hard | R32 | Onny Parun | 7-5 8-6 |
| 1974 | Jakarta | Hard | R16 | Onny Parun | 6-2 6-2 |
| 1974 | San Francisco | Carpet | R64 | Onny Parun | 4-6 6-3 6-3 |
| 1974 | Auckland | Grass | QF | Onny Parun | 7-5 5-7 4-6 6-2 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.