Ground: Clay
| ITF M25 Koszalin | 2025/07/29 11:03 | Giammarco Gandolfi v Massimo Pizzigoni | 0-6,4-6 |
| ITF M25 Bacau | 2025/07/22 06:30 | Valentin Basel v Giammarco Gandolfi | 6-4,6-4 |
| ITF M15 Poprad | 2025/07/16 09:00 | Dominik Kellovsky v Giammarco Gandolfi | 7-6,6-3 |
| ITF M25 Kiseljak | 2025/06/12 09:30 | Marat Sharipov v Giammarco Gandolfi | 6-1,6-0 |
| ITF M25 Kiseljak | 2025/06/11 08:00 | Admir Kalender v Giammarco Gandolfi | 2-6,4-6 |
| ITF M25 Kiseljak | 2025/06/10 10:30 | Giammarco Gandolfi v Luka Todorovic | 6-1,6-2 |
| ITF M25 Cervia | 2025/05/19 08:30 | Manuel Mazza v Giammarco Gandolfi | 6-4,6-3 |
| ITF M25 Cervia | 2025/05/18 08:00 | Giammarco Gandolfi v Luca Parenti | 6-2,6-3 |
| ITF M15 Tashkent | 2025/05/28 09:00 | Amir Milushev v Gian Gruenig | 6-1,7-6 |
| ITF M15 Tashkent | 2025/05/22 07:00 | Gian Gruenig v Igor Kudriashov | 3-6,3-6 |
| ITF M15 Heraklion | 2025/05/07 12:58 | Gian Gruenig v Rafael De Alba | 4-6,3-6 |
| ITF M25 Nottingham | 2025/04/28 10:30 | Luke Hooper v Gian Gruenig | 6-2,4-6,0-0 |
| ITF M25 Nottingham | 2025/04/27 09:00 | Gian Gruenig v Matt Hulme | 5-7,7-6,1-0 |
| ITF M15 Heraklion | 2025/03/28 08:30 | Gian Gruenig v Stuart Parker | 6-1,1-6,4-6 |
| ITF M25 Trimbach | 2025/03/05 11:45 | Gian Gruenig v Antoine Walch | 4-6,4-6 |
| Challenger Lugano | 2025/02/23 12:45 | Gian Gruenig v Juan Carlos Prado Angelo | 7-5,4-6,4-6 |