By surface
| Surface | Kento Yamada | Johannes Helgo |
|---|---|---|
| Hard | 1 | 0 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1989-02-20 | WTA | Wichita | Round of 16 | Hard | Barbara Potter | 2-6 | 2-6 |
| Surface | Kento Yamada | Johannes Helgo |
|---|---|---|
| Hard | 1 | 0 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1989-02-20 | WTA | Wichita | Round of 16 | Hard | Barbara Potter | 2-6 | 2-6 |