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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 19y 54d | Halle 2016 | |
| 2 | 20y 44d | Queen's Club 2023 | |
| 3 | 20y 51d | Queen's Club 2023 | |
| 4 | 20y 59d | Halle 2017 | |
| 5 | 20y 307d | Halle 2021 | |
| 6 | 21y 26d | Queen's Club 2012 | |
| 7 | 21y 28d | Halle 2017 | |
| 8 | 21y 215d | Halle 2018 | |
| 9 | 22y 42d | Queen's Club 2025 | |
| 10 | 22y 58d | Queen's Club 2021 |
