Stadium: Hard 17 Round: 44 Ground: Hardcourt outdoor
| 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 M25 Bielsko Biala | 2023/08/14 07:30 | Piotr Siekanowicz v Tomas Vaise | 6-4,4-6,10-4 |
| ITF M25 Lodz | 2023/08/08 11:05 | Piotr Grynkowski v Piotr Siekanowicz | 6-4,6-1 |
| ITF M25 Lodz | 2023/08/08 07:30 | Piotr Siekanowicz v Gabriel Matuszewski | 1-6,7-6,10-6 |
| ITF M25 Lajeado | 2023/10/09 16:00 | Glauco Pinheiro Da Cruz Junior v Ryan A Dos Santos | 1-6,3-6 |
| ITF M15 Belem | 2023/08/15 13:00 | Lucas Andrade da Silva v Glauco Pinheiro Da Cruz Junior | 6-0,6-2 |
| ITF M15 Belem | 2023/08/14 13:00 | Glauco Pinheiro Da Cruz Junior v Benjamin Torres | 7-5,7-6 |
| ITF M15 Mogi das Cruzes | 2023/04/24 13:00 | Glauco Pinheiro Da Cruz Junior v Joao Eduardo Schiessl | 2-6,0-6 |
| ITF M15 Monastir | 2023/04/16 09:00 | Sebastian Sorger v Glauco Pinheiro Da Cruz Junior | 6-1,6-2 |
| ITF M15 Monastir | 2023/04/09 08:00 | Louis Allen v Glauco Pinheiro Da Cruz Junior | 6-0,6-2 |
| ITF M15 Monastir | 2023/04/03 10:00 | Abraham Asaba v Glauco Pinheiro Da Cruz Junior | 6-2,6-4 |
| ITF M15 Monastir | 2023/03/26 08:45 | Rishabdev Raman v Glauco Pinheiro Da Cruz Junior | 6-0,6-1 |