Head to head
0
Hard
1
1
Clay
0
1
Carpet
0
Thomaz Koch's wins on the left · Allan Stone's on the right · bar lengths share one scale
All meetings (3)
| 1975 | Caracas WCT | Hard | R32 | Allan Stone | 6-2 5-7 6-3 |
| 1975 | Sao Paulo WCT | Carpet | R16 | Thomaz Koch | 4-6 6-4 6-2 |
| 1969 | Washington | Clay | R16 | Thomaz Koch | 6-2 6-2 |
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.