| Name | J. Niemeier |
| Country | Germany |
| DOB | 12.08.1999 |
| Season | Type | Rank | Titles | Won | Lost | Hard Won | Hard Lost | Clay Won | Clay Lost | Grass Won | Grass Lost |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 2022 | doubles | 0 | 2 | 3 | 0 | 1 | 1 | 2 | |||
| 2021 | doubles | 0 | 0 | 1 | |||||||
| 2019 | doubles | 0 | 0 | 1 | 0 | 1 | |||||
| 2018 | doubles | 675 | 0 | 0 | 1 | 0 | 1 | ||||
| 2017 | doubles | 0 | 5 | 4 | 3 | 2 | 0 | 1 | 2 | 1 | |
| 2022 | singles | 65 | 2 | 40 | 22 | 12 | 10 | 22 | 8 | 5 | 3 |
| 2021 | singles | 133 | 1 | 31 | 18 | 9 | 9 | 13 | 7 | 4 | 2 |
| 2020 | singles | 261 | 0 | 12 | 11 | 7 | 5 | 5 | 6 | ||
| 2019 | singles | 306 | 0 | 6 | 4 | 6 | 4 | ||||
| 2018 | singles | 435 | 0 | 0 | 3 | 0 | 3 | ||||
| 2017 | singles | 976 | 0 | 7 | 4 | 3 | 2 | 2 | 1 | 2 | 1 |
| 2023 | singles | 165 | 0 | 16 | 29 | 7 | 18 | 4 | 7 | 4 | 3 |
| 2023 | doubles | 436 | 0 | 2 | 2 | 1 | 0 | 0 | 1 | 1 | 0 |
| 2024 | singles | 89 | 0 | 34 | 28 | 18 | 13 | 12 | 8 | 4 | 6 |
| 2024 | doubles | 547 | 0 | 1 | 1 | 1 | 1 | ||||
| 2025 | singles | 246 | 0 | 11 | 24 | 5 | 9 | 5 | 11 | 1 | 2 |
| 2025 | doubles | 1018 | 0 | 1 | 2 | 0 | 1 | 1 | 0 |
| Name | Season | Type | Surface | Prize |
|---|---|---|---|---|
| W60 Zagreb (ITF) | 2022 | singles | clay | $60,000 |
| W25 Prague (ITF) | 2021 | singles | $25,000 | |
| Makarska (Challenger) | 2022 | singles | clay | $115,000 |
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