Head to head
0
Clay
2
0
Grass
5
1
Carpet
0
Onny Parun's wins on the left · Clark Graebner's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (8)
| 1973 | South Orange | Grass | QF | Clark Graebner | 6-2 6-4 |
| 1971 | South Orange | Grass | SF | Clark Graebner | 1-6 6-1 6-2 1-6 7-6 |
| 1971 | Indianapolis | Clay | R32 | Clark Graebner | 6-3 6-2 |
| 1970 | Indianapolis | Clay | R32 | Clark Graebner | 6-4 6-4 |
| 1970 | Macon | Carpet | R16 | Onny Parun | 6-3 6-4 |
| 1969 | Bristol | Grass | R64 | Clark Graebner | 6-4 6-2 |
| 1969 | Manchester | Grass | R32 | Clark Graebner | 6-4 6-3 |
| 1968 | Bristol | Grass | R32 | Clark Graebner | 6-0 5-7 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.