Head to head
0
Hard
1
1
Grass
0
1
Carpet
0
Earl Butch Buchholz's wins on the left · Mark Cox's on the right · bar lengths share one scale
All meetings (3)
| 1970 | Johannesburg | Hard | R16 | Mark Cox | 1-6 6-1 3-1 RET |
| 1970 | Philadelphia | Carpet | R64 | Earl Butch Buchholz | 3-6 6-2 6-3 |
| 1969 | US Open | Grass | R32 | Earl Butch Buchholz | 13-11 6-4 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.