Head to head
2
Hard
0
1
Clay
0
1
Grass
0
1
Carpet
0
Clark Graebner's wins on the left · Ion Tiriac's on the right · bar lengths share one scale
All meetings (5)
| 1975 | Bahamas | Hard | R16 | Clark Graebner | 7-5 6-4 |
| 1973 | Paramus | Hard | QF | Clark Graebner | 6-4 6-4 |
| 1971 | Hampton | Carpet | SF | Clark Graebner | 6-2 6-2 7-5 |
| 1970 | Indianapolis | Clay | R16 | Clark Graebner | 1-6 6-3 6-1 |
| 1970 | Wimbledon | Grass | R64 | Clark Graebner | 4-6 14-12 6-2 RET |
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.