Stadium: Court 6 Round: 26 Ground: Hardcourt outdoor
| ITF - M15 Monastir | 2021/06/23 13:30 | Weightman, Oscar v Kelsey Stevenson | 1-6,7-5,7-5 |
| ITF - M15 Monastir | 2021/06/21 08:00 | Giles Hussey v Weightman, Oscar | 3-6,3-6 |
| ITF - M15 Monastir | 2021/06/20 09:00 | Noah Lopez v Weightman, Oscar | 6-7,0-6 |
| ITF - M15 Monastir | 2021/06/14 13:30 | Aidan Mayo v Weightman, Oscar | 6-2,4-6,10-7 |
| ITF - M15 Monastir | 2021/06/14 09:00 | Bruna, Esteban v Weightman, Oscar | 4-6,2-6 |
| ITF - M15 Monastir | 2021/06/07 08:00 | Weightman, Oscar v Ezequiel Simonit | 4-6,2-6 |
| ITF - M15 Monastir | 2021/06/06 09:00 | Weightman, Oscar v Vukovic, Luka | 6-4,6-3 |
| ITF M15 Kouvola | 2021/05/27 11:00 | Anton Matusevich v Weightman, Oscar | 6-0,6-4 |
| ITF - M15 Monastir | 2021/06/22 12:15 | Ghem, Andre v Duckhee Lee | 2-6,2-6 |
| ITF - M15 Monastir | 2021/06/16 11:10 | Luca Giacomini v Duckhee Lee | 6-3,6-1 |
| ITF - M15 Monastir | 2021/06/08 11:00 | Siddhant Banthia v Duckhee Lee | 6-3,2-6,6-4 |
| Challenger - Oeiras | 2021/04/06 09:00 | Hugo Grenier v Duckhee Lee | 6-0,6-3 |
| Challenger - Oeiras | 2021/03/30 12:35 | Duckhee Lee v Cacao, Tiago | 3-6,4-6 |
| ITF - M15 Antalya | 2021/03/26 07:00 | Duckhee Lee v Madaras, Dragos Nicolae | 5-7,3-6 |
| ITF - M15 Antalya | 2021/03/24 08:00 | Duckhee Lee v Sveridenko, Vladislav | 6-3,6-0 |
| ITF - M15 Antalya | 2021/03/18 06:55 | Duckhee Lee v Mate Valkusz | 1-6,1-6 |