Stadium: Centre Court Round: 25 Ground: Clay
| ITF M25 Frankfurt am Main | 2021/08/11 14:00 | Mertens, Yannick v Daniel Cukierman | 3-6,3-6 |
| ITF M25 Ajaccio | 2021/07/08 07:00 | Pourroy, Loris v Mertens, Yannick | 6-1,4-6,6-3 |
| ITF M25 Ajaccio | 2021/07/07 10:00 | Pierre Antoine Tailleu v Mertens, Yannick | 4-6,4-6 |
| ITF M25 Bakio | 2021/06/29 15:20 | Mertens, Yannick v Harrison, Christian | 2-6,6-3,4-6 |
| ITF M15 Marbella | 2021/05/30 09:00 | Diego F Flores v Mertens, Yannick | 2-6,1-6 |
| ITF M15 Marbella | 2021/05/29 07:55 | Mertens, Yannick v Nicolas Alvarez Varona | 1-6,7-5,6-3 |
| ITF M15 Marbella | 2021/05/28 10:25 | Alejandro Moro Canas v Mertens, Yannick | 4-6,5-7 |
| ITF M15 Marbella | 2021/05/27 09:20 | Mora, Maxime v Mertens, Yannick | 5-7,0-6 |
| ITF M25 Frankfurt am Main | 2021/08/12 11:50 | Bovy, Arnaud v Yshai Oliel | 3-6,4-6 |
| ITF M25 Frankfurt am Main | 2021/08/11 10:40 | Tim Handel v Bovy, Arnaud | 7-5,3-6,2-6 |
| ITF M15 Esch/Alzette | 2021/07/20 14:05 | Dan Added v Bovy, Arnaud | 6-4,6-2 |
| ITF M25 Marburg | 2021/07/07 09:00 | Maik Steiner v Bovy, Arnaud | 6-3,6-7,6-7 |
| ITF - M15 Antalya | 2021/05/19 11:35 | Benjamin Hassan v Bovy, Arnaud | 7-5,6-3 |
| ITF M25 La Nucia | 2021/03/16 10:00 | Alex M Pujolras v Bovy, Arnaud | 6-2,6-2 |
| ITF - M15 Sharm El Sheikh | 2021/02/10 07:30 | Zizou Bergs v Bovy, Arnaud | 5-7,1-6 |
| ITF - M15 Sharm El Sheikh | 2021/02/07 07:30 | Yu Hsiou Hsu v Bovy, Arnaud | 6-4,6-4 |