Head to head
1
Clay
0
2
Grass
0
1
Carpet
0
Clark Graebner's wins on the left · Ray Ruffels's on the right · bar lengths share one scale
All meetings (4)
| 1970 | Cincinnati | Clay | R16 | Clark Graebner | 4-6 6-2 9-7 |
| 1969 | Wimbledon | Grass | R128 | Clark Graebner | 6-4 8-6 6-3 |
| 1968 | Davis Cup WG CR: AUS vs USA | Grass | RR | Clark Graebner | 3-6 8-6 2-6 6-3 6-1 |
| 1968 | New York-1 | Carpet | R32 | Clark Graebner | 9-7 4-6 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.