By surface
| Surface | John Howarth | Kostyantyn Kalchev |
|---|---|---|
| Hard | 0 | 1 |
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2015-04-17 | WTA | Fed Cup G2 PO: PHI vs INA | Round Robin | Hard | Katharina Lehnert | 4-6 | 2-6 |
| Surface | John Howarth | Kostyantyn Kalchev |
|---|---|---|
| Hard | 0 | 1 |
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2015-04-17 | WTA | Fed Cup G2 PO: PHI vs INA | Round Robin | Hard | Katharina Lehnert | 4-6 | 2-6 |