Head to head
2
Hard
1
1
Clay
0
1
Grass
0
1
Carpet
0
Tom Okker's wins on the left · Onny Parun's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1978 | Wimbledon | Grass | R128 | Tom Okker | 6-8 6-3 6-3 6-2 |
| 1977 | Richmond WCT | Carpet | R16 | Tom Okker | 6-3 6-2 |
| 1976 | Johannesburg WCT | Hard | SF | Onny Parun | 6-2 6-4 |
| 1975 | Johannesburg WCT | Hard | QF | Tom Okker | 7-5 4-6 7-6(5) |
| 1973 | Los Angeles | Hard | R32 | Tom Okker | 7-6 6-3 |
| 1973 | Gstaad | Clay | R16 | Tom Okker | 6-4 6-2 |
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.