Head to head
0
Hard
3
1
Clay
1
2
Carpet
1
Thomaz Koch's wins on the left · Arthur Ashe's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (8)
| 1975 | Indianapolis | Clay | R16 | Arthur Ashe | 4-6 6-4 6-2 |
| 1974 | Paris | Hard | QF | Arthur Ashe | 6-4 2-6 6-2 |
| 1970 | Berkeley | Hard | QF | Arthur Ashe | 6-4 7-5 |
| 1970 | Hampton | Carpet | QF | Thomaz Koch | 7-5 3-6 6-4 |
| 1970 | New York | Carpet | RR | Arthur Ashe | 6-5 |
| 1969 | Berkeley | Hard | 3rd/4th | Arthur Ashe | 8-6 |
| 1969 | Washington | Clay | F | Thomaz Koch | 7-5 9-7 4-6 2-6 6-4 |
| 1969 | Richmond | Carpet | SF | Thomaz Koch | 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.