By surface
| Surface | Koji Watanabe | Van Bay Vo |
|---|
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1970-04-10 | ATP | Davis Cup WG SF: JPN vs VIE | Round Robin | — | Koji Watanabe | 6-2 | 6-3 | 6-4 |
| Surface | Koji Watanabe | Van Bay Vo |
|---|
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1970-04-10 | ATP | Davis Cup WG SF: JPN vs VIE | Round Robin | — | Koji Watanabe | 6-2 | 6-3 | 6-4 |