Stadium: Court 3 Round: 25 Ground: Clay
| ITF M15 Esch/Alzette | 2021/07/19 09:00 | Lucas Szewczyk v Guillaume Dermiens | 3-6,2-6 |
| ITF M15 Esch/Alzette | 2021/07/18 14:25 | Floris Podzimek v Guillaume Dermiens | 3-6,1-6 |
| ITF M25 Marburg | 2021/07/05 08:00 | Florian Broska v Guillaume Dermiens | 7-5,6-4 |
| ITF M25 Alkmaar | 2021/06/21 14:25 | Guillaume Dermiens v Zachary Eisinga | 4-6,7-5,13-11 |
| ITF M25 Alkmaar | 2021/06/20 10:30 | Takanyi Garanganga v Guillaume Dermiens | 3-6,1-6 |
| ITF M15 Antalya | 2021/06/08 07:00 | Franco Roncadelli v Guillaume Dermiens | 6-2,6-0 |
| ITF M15 Antalya | 2021/06/07 09:35 | Credit Chaiyarin v Guillaume Dermiens | 0-6,4-6 |
| ITF M15 Antalya | 2021/05/31 08:30 | Nicolas Parizzia v Guillaume Dermiens | 6-3,1-6,10-5 |
| Davis Cup | 2021/06/19 09:35 | Egill Sigurdsson v Raphael Calzi | 4-6,0-6 |
| Davis Cup | 2021/06/17 09:05 | Raphael Calzi v Liam Delicata | 6-3,6-4 |
| ITF M15 Monastir | 2021/04/04 10:30 | Igor Marcondes v Raphael Calzi | 7-6,7-6 |
| ITF M15 Monastir | 2021/03/28 10:30 | Raphael Calzi v Youcef Rihane | 6-7,4-6 |
| ITF M15 Saarlouis | 2019/07/01 08:00 | Eduardo Dischinger v Raphael Calzi | 7-5,4-6,10-4 |
| ITF M25 Arlon | 2019/06/24 13:20 | Victor Vlad Cornea v Raphael Calzi | 7-5,6-3 |
| ITF Germany F11 | 2018/08/05 12:00 | Raphael Calzi v Robi Tholl | 2-6,4-6 |
| ITF Germany F9 | 2018/07/22 11:00 | Tim Heger v Raphael Calzi | 6-2,6-1 |