Head to head
1
Hard
0
1
Grass
0
Tom Okker's wins on the left · Clark Graebner's on the right · bar lengths share one scale
All meetings (2)
| 1971 | US Open | Grass | QF | Tom Okker | 6-2 6-3 6-4 |
| 1968 | Johannesburg-1 | Hard | SF | Tom Okker | 4-6 6-4 6-4 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.