Stadium: Court 15 Round: 26 Ground: Hardcourt indoor
| ITF M25 Plaisir | 2021/09/15 09:35 | Yannick Mertens v Paul Cayre | 6-4,6-1 |
| ITF M25 Sintra | 2021/09/08 12:25 | Yannick Mertens v Felix Corwin | 7-6,3-6,4-6 |
| 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 M25 Plaisir | 2021/09/15 07:55 | Tristan Schoolkate v Giovanni Mpetshi Perricard | 7-6,6-4 |
| ITF M25 Eupen | 2021/09/09 07:30 | Tristan Schoolkate v Facundo Diaz Acosta | 1-6,7-6,2-6 |
| ITF M25 Eupen | 2021/09/07 11:00 | Tristan Schoolkate v Dominik Boehler | 6-4,6-1 |
| ITF M25 Sierre | 2021/09/02 11:05 | Tristan Schoolkate v Valentin Vacherot | 4-6,2-6 |
| ITF M25 Sierre | 2021/08/31 07:55 | Luca Potenza v Tristan Schoolkate | 6-4,6-7,4-6 |
| ITF M25 Caslano | 2021/08/25 13:00 | Tristan Schoolkate v Alexander Weis | 4-6,3-6 |
| ITF M25 Muttenz | 2021/08/19 09:45 | Tristan Schoolkate v Rinky Hijikata | 6-7,4-6 |
| ITF M25 Muttenz | 2021/08/18 14:35 | Jacopo Berrettini v Tristan Schoolkate | 1-6,4-6 |