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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 234d | Halle 2018 | |
| 2 | 17y 249d | Queen's Club 2011 | |
| 3 | 17y 300d | Halle 2024 | |
| 4 | 18y 55d | Halle 2015 | |
| 5 | 18y 65d | Queen's Club 2017 | |
| 6 | 18y 153d | Queen's Club 2013 | |
| 7 | 18y 158d | Queen's Club 2012 | |
| 8 | 18y 212d | Halle 2015 | |
| 9 | 18y 228d | Halle 2016 | |
| 10 | 18y 233d | Halle 2019 | |
| 11 | 18y 248d | Queen's Club 2015 | |
| 12 | 18y 255d | Queen's Club 2012 | |
| 13 | 18y 299d | Halle 2025 | |
| 14 | 19y 29d | Queen's Club 2011 | |
| 15 | 19y 45d | Halle 2022 | |
| 16 | 19y 54d | Halle 2016 | |
| 17 | 19y 64d | Queen's Club 2018 | |
| 18 | 19y 65d | Queen's Club 2015 | |
| 19 | 19y 138d | Queen's Club 2017 | |
| 20 | 19y 172d | Queen's Club 2021 |
