Head to head
1
Hard
1
0
Clay
1
0
Grass
1
0
Carpet
1
Mark Cox's wins on the left · Thomaz Koch's on the right · bar lengths share one scale
All meetings (5)
| 1976 | Buenos Aires | Clay | R16 | Thomaz Koch | 3-6 6-4 8-6 |
| 1974 | Sao Paulo WCT | Carpet | QF | Thomaz Koch | 6-3 6-4 |
| 1969 | Davis Cup EUR SF: GBR vs BRA | Grass | RR | Thomaz Koch | 4-6 11-13 6-3 8-6 8-6 |
| 1969 | Caracas | Hard | F | Thomaz Koch | 8-6 6-3 2-6 6-4 |
| 1968 | Durban-1 | Hard | R16 | Mark Cox | 6-0 11-9 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.