By surface
| Surface | Isao Watanabe | Hans Hartoch |
|---|---|---|
| Clay | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-07-22 | ATP | Hilversum | Round of 64 | Clay | Isao Watanabe | 6-4 | 6-1 |
| Surface | Isao Watanabe | Hans Hartoch |
|---|---|---|
| Clay | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1968-07-22 | ATP | Hilversum | Round of 64 | Clay | Isao Watanabe | 6-4 | 6-1 |