Head to head
0
Hard
3
1
Carpet
0
Onny Parun's wins on the left · Buster C. Mottram's on the right · bar lengths share one scale
All meetings (4)
| 1981 | Stuttgart-1 | Hard | R32 | Buster C. Mottram | 2-2 RET |
| 1980 | Atlanta | Hard | R16 | Buster C. Mottram | 6-3 6-3 |
| 1980 | Cleveland | Hard | R16 | Buster C. Mottram | 6-3 3-6 6-3 |
| 1973 | London-3 | Carpet | R32 | Onny Parun | 7-5 6-3 |
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.