Stadium: Hard 17 Round: 44 Ground: Hardcourt outdoor
| ITF M15 Heraklion | 2023/10/22 11:00 | Vadym Konovchuk v Piotr Siekanowicz | 6-2,3-6,6-10 |
| ITF M15 Heraklion | 2023/10/16 09:00 | Ioannis Kountourakis v Piotr Siekanowicz | 6-3,6-0 |
| ITF M15 Heraklion | 2023/10/15 08:30 | Piotr Siekanowicz v Glauco Pinheiro Da Cruz Junior | 6-4,6-1 |
| ITF M15 Koszalin | 2023/09/06 14:15 | Dominik Kellovsky v Piotr Siekanowicz | 6-4,7-5 |
| ITF M15 Koszalin | 2023/09/05 07:30 | Piotr Kusiewicz v Piotr Siekanowicz | 5-7,7-6,8-10 |
| ITF M15 Koszalin | 2023/09/04 07:30 | Piotr Siekanowicz v Michalis Sakellaridis | 7-6,4-6,10-8 |
| ITF M15 Szczawno | 2023/08/27 07:00 | Karol Filar v Piotr Siekanowicz | 6-4,6-4 |
| ITF M25 Bielsko Biala | 2023/08/14 12:00 | Matyas Cerny v Piotr Siekanowicz | 6-7,6-1,10-6 |
| ITF M15 Heraklion | 2023/10/17 06:30 | Adam Heinonen v Ki Lung NG | 5-7,4-6 |
| ITF M25 Falun | 2023/09/26 12:00 | Adam Heinonen v Evgeny Karlovskiy | 6-7,1-6 |
| ITF M25 Falun | 2023/09/25 08:00 | Adam Heinonen v Jack Karlsson Winstrand | 6-1,6-3 |
| ITF M25 Falun | 2023/09/24 07:55 | Adam Heinonen v Linus Videhult | 6-3,6-3 |
| ITF M15 Danderyd | 2023/09/19 12:00 | Adam Heinonen v Jakob Schnaitter | 2-6,2-6 |
| ITF M25 Ystad | 2023/08/15 12:25 | Marvin Moeller v Adam Heinonen | 6-2,6-7,7-5 |
| ITF M15 Hyvinkaa | 2023/08/04 09:00 | Adam Heinonen v Leonardo Rossi | 4-6,3-6 |
| ITF M15 Hyvinkaa | 2023/08/02 15:00 | Adam Heinonen v Niccolo Catini | 6-1,6-2 |