| Name | J. Kumstat |
| Country | Czech Republic |
| DOB | 02.01.2007 |
| Season | Type | Rank | Titles | Won | Lost | Hard Won | Hard Lost | Clay Won | Clay Lost | Grass Won | Grass Lost |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | doubles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| doubles | |||||||||||
| 2 | doubles | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 0 | doubles | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 2 | singles | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 |
| 0 | singles | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| singles | |||||||||||
| 1 | singles | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| 3 | singles | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| 2023 | singles | 0 | 2 | 2 | 2 | 2 | |||||
| 2022 | singles | 0 | 0 | 3 | 0 | 1 | 0 | 2 | |||
| 2023 | doubles | 0 | 2 | 1 | 2 | 1 | |||||
| 2022 | doubles | 2094 | 0 | 1 | 1 | 1 | 1 | ||||
| 2024 | doubles | 1 | 10 | 2 | 2 | 1 | 4 | 0 | 4 | 1 | |
| 2024 | singles | 2013 | 1 | 12 | 6 | 6 | 2 | 5 | 3 | 1 | 1 |
| 2025 | doubles | 2 | 22 | 10 | 9 | 2 | 11 | 7 | 2 | 1 | |
| 2025 | singles | 711 | 0 | 28 | 22 | 10 | 11 | 17 | 10 | 1 | 1 |
| Name | Season | Type | Surface | Prize |
|---|---|---|---|---|
| Pardubicka juniorka | 2024 | doubles | clay | |
| Pardubicka juniorka | 2024 | singles | clay | |
| Australian Open | 2025 | doubles | hard | |
| M15 Monastir 37 (ITF) | 2025 | doubles | hard | $15,000 |
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