Stadium: Court 1 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Mataro | 2023/05/22 09:30 | Guilherme Valdoleiros v Tomas C Abasolo | 5-7,1-6 |
| ITF M25 Mataro | 2023/05/21 09:00 | Guilherme Valdoleiros v Thomas Nicholas Gadecki | 6-7,7-5,10-8 |
| ITF M25 Valldoreix | 2023/05/08 08:00 | Vilius Gaubas v Guilherme Valdoleiros | 6-1,6-1 |
| ITF M25 Valldoreix | 2023/05/07 12:30 | Guilherme Valdoleiros v Dimitris Sakellaridis | 6-4,6-4 |
| ITF M25 Sabadell | 2023/04/30 07:00 | Guilherme Valdoleiros v Gerard Campana Lee | 2-6,2-6 |
| ITF M25 Portimao | 2023/03/14 10:00 | Alejandro T Alvarez v Guilherme Valdoleiros | 7-6,6-1 |
| ITF M25 Portimao | 2023/03/13 12:25 | Artsiom Dabryian v Guilherme Valdoleiros | 5-7,4-6 |
| ITF M25 Portimao | 2023/03/12 12:00 | Guilherme Valdoleiros v Stefan Cooper | 2-6,7-6,12-10 |
| ITF M25 Ajaccio | 2023/07/05 07:00 | Guillaume Dalmasso v Lucas Poullain | 4-6,5-7 |
| ITF M25 Ajaccio | 2023/07/03 16:25 | Adan Freire Da Silva v Guillaume Dalmasso | 6-2,6-1 |
| ITF M25 Ajaccio | 2023/07/02 19:35 | Enzo Frequelin v Guillaume Dalmasso | 4-6,2-6 |
| ITF M15 Irvine | 2023/06/26 17:00 | Quinn Vandecasteele v Guillaume Dalmasso | 1-6,6-3,10-6 |
| ITF M15 Los Angeles | 2023/06/21 21:30 | Guillaume Dalmasso v James Watt | 1-6,5-7 |
| ITF M15 Los Angeles | 2023/06/20 17:00 | Jonas Eriksson Ziverts v Guillaume Dalmasso | 7-5,6-0 |
| ITF M15 Fayetteville | 2022/11/02 16:15 | Guillaume Dalmasso v Warren Wood | 2-6,4-6 |
| ITF M15 Fayetteville | 2022/11/01 15:00 | Santiago Giamichelle v Guillaume Dalmasso | 6-2,3-6,7-10 |