Head to head
1
Hard
2
1
Clay
1
0
Grass
1
Joaquin Loyo-Mayo'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 (7)
| 1971 | Columbus | Hard | R32 | Clark Graebner | W/O |
| 1971 | Jacksonville | Clay | QF | Clark Graebner | 4-6 6-3 6-2 |
| 1970 | Los Angeles-2 | Hard | R32 | Clark Graebner | 6-1 6-3 |
| 1970 | Washington | Clay | R32 | Joaquin Loyo-Mayo | 6-4 6-3 |
| 1969 | Omaha | Hard | SF | Joaquin Loyo-Mayo | 7-5 6-3 |
| 1968 | Boston-2 | Grass | QF | Clark Graebner | 6-1 6-4 6-3 |
| 1968 | Davis Cup AME F: USA vs MEX | Hard | RR | Clark Graebner | 6-3 8-6 4-6 6-4 |
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.