By surface
| Surface | Charles Chang | Koji Watanabe |
|---|---|---|
| Hard | 0 | 1 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1972-03-29 | ATP | Hong Kong | Round of 32 | Hard | Koji Watanabe | 3-6 | 0-6 |
| Surface | Charles Chang | Koji Watanabe |
|---|---|---|
| Hard | 0 | 1 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1972-03-29 | ATP | Hong Kong | Round of 32 | Hard | Koji Watanabe | 3-6 | 0-6 |