Head to head
2
Hard
1
1
Carpet
0
Thomaz Koch's wins on the left · Erik Van Dillen's on the right · bar lengths share one scale
All meetings (4)
| 1977 | Carlsbad | Hard | R64 | Erik Van Dillen | 6-3 6-1 |
| 1973 | Caracas | Hard | RR | Thomaz Koch | 6-3 6-3 |
| 1972 | Los Angeles-1 | Hard | R32 | Thomaz Koch | 6-4 4-6 6-3 |
| 1972 | Omaha | Carpet | R16 | Thomaz Koch | 7-6 7-5 |
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.