Head to head
1
Hard
0
1
Grass
0
Clark Graebner's wins on the left · John Alexander's on the right · bar lengths share one scale
All meetings (3)
| 1973 | Boston | Hard | QF | Clark Graebner | 7-5 6-4 |
| 1969 | Queen's Club | Grass | R64 | Clark Graebner | 7-5 8-6 |
| 1968 | Lugano | Clay | R32 | John Alexander | W/O |
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.