Stadium: Hard 18 Round: 44 Ground: Hardcourt outdoor
| ITF - M15 Sharm El Sheikh | 2023/10/04 10:30 | Tanner, Gian Luca v Dzhavakian, Yurii | 3-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2023/10/03 07:00 | Tanner, Gian Luca v Akram El Sallaly | 6-0,6-0 |
| ITF - M15 Sharm El Sheikh | 2023/10/02 07:00 | Tanner, Gian Luca v Macherla, Theertha Shashank | 6-3,6-1 |
| ITF - M15 Sharm El Sheikh | 2023/09/27 07:00 | Peter Buldorini v Tanner, Gian Luca | 6-3,4-6,7-5 |
| ITF M25 Sion | 2023/08/29 07:55 | Tanner, Gian Luca v Federico Iannaccone | 1-6,6-2,6-7 |
| ITF M25 Sion | 2023/08/28 14:25 | Tanner, Gian Luca v Brun, Thomas George | 6-0,6-0 |
| ITF M25 Sion | 2023/08/27 08:00 | Tanner, Gian Luca v Sacha Ouzilou | 6-0,6-1 |
| ITF M25 Muttenz | 2023/08/15 14:05 | Tanner, Gian Luca v Florent Bax | 1-6,4-6 |
| ITF - M15 Héraklion | 2023/10/15 08:30 | Evangelos Kypriotis v Thomas Kostka | 2-6,1-6 |
| ITF - M25 Grasse | 2023/06/11 08:30 | Theo Herrmann v Thomas Kostka | 6-2,6-4 |
| ITF - M15 Monastir | 2023/03/13 15:00 | Thomas Kostka v Zoran Ludoski | 3-6,2-6 |
| ITF - M15 Monastir | 2023/03/13 08:30 | Linang Xiao v Thomas Kostka | 4-6,7-5,7-10 |
| ITF - M25 Grasse | 2022/06/12 12:55 | Yann Marti v Thomas Kostka | 6-2,6-2 |