William Jansen
Nation
GBR
World Ranking
ATP Ranking　1177th
Year-end Junior World Ranking
- Year-end 2022 79th
- Year-end 2021 212th
- Year-end 2020 713th
- Year-end 2019 2108th
Match Details
2022 Us Open Junior
| W | 1R | Jeremy Jin | 6-1 6-3 |
| L | 2R | Michael Zheng | 2-6 5-7 |
2022 Wimbledon Junior
| W | 1R | Juan Carlos Prado Angelo | 7-5 7-6 |
| L | 2R | Gilles Arnaud Bailly | 4-6 3-6 |
2021 Wimbledon Junior
| L | 1R | Bruno Kuzuhara | 5-7 7-6 3-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 9524, Number of registered players: 5,032, Number of registered results: 218,569