Stadium: Court 12 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Bagneres-De-Bigorre | 2021/09/01 11:40 | Yannick Mertens v Titouan Droguet | 2-6,6-2,3-6 |
| ITF M25 Koksijde | 2021/08/17 16:20 | Yannick Mertens v Arnaud Bovy | 7-5,1-6,5-7 |
| ITF M25 Frankfurt am Main | 2021/08/11 14:00 | Yannick Mertens v Daniel Cukierman | 3-6,3-6 |
| ITF M25 Ajaccio | 2021/07/08 07:00 | Loris Pourroy v Yannick Mertens | 6-1,4-6,6-3 |
| ITF M25 Ajaccio | 2021/07/07 10:00 | Pierre Antoine Tailleu v Yannick Mertens | 4-6,4-6 |
| ITF M25 Bakio | 2021/06/29 15:20 | Yannick Mertens v Christian Harrison | 2-6,6-3,4-6 |
| ITF M15 Marbella | 2021/05/30 09:00 | Diego F Flores v Yannick Mertens | 2-6,1-6 |
| ITF M15 Marbella | 2021/05/29 07:55 | Yannick Mertens v Nicolas Alvarez Varona | 1-6,7-5,6-3 |
| ITF M15 Monastir | 2021/09/02 08:00 | Max Alcala Gurri v Felix Corwin | 6-3,1-6,7-5 |
| ITF M15 Monastir | 2021/09/01 11:05 | Alex Knaff v Felix Corwin | 7-5,6-7,3-6 |
| ITF M15 Monastir | 2021/08/27 09:30 | Felix Corwin v Robin Bertrand | 4-6,4-6 |
| ITF M15 Monastir | 2021/08/26 14:30 | Felix Corwin v Terence Atmane | 2-6,6-4,7-6 |
| ITF M15 Monastir | 2021/08/25 09:00 | Felix Corwin v Omni Kumar | 6-7,6-4,6-1 |
| ITF M15 Monastir | 2021/08/18 07:30 | Felix Corwin v Luciano Darderi | 4-6,3-6 |
| ITF M25 Decatur | 2021/08/04 13:50 | Shintaro Imai v Felix Corwin | 6-1,6-2 |
| ITF M25 Champaign | 2021/07/29 17:00 | Yu Hsiou Hsu v Felix Corwin | 7-6,6-4 |