By surface
| Surface | Thomaz Koch | Dennis Ralston |
|---|---|---|
| Hard | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1969-09-20 | ATP | Los Angeles | Round of 16 | Hard | Thomaz Koch | 6-1 | 8-10 | 6-1 |
| Surface | Thomaz Koch | Dennis Ralston |
|---|---|---|
| Hard | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1969-09-20 | ATP | Los Angeles | Round of 16 | Hard | Thomaz Koch | 6-1 | 8-10 | 6-1 |