| ITF - M25 Saraievo | 06/06 09:00 | 26 | Buvaysar Gadamauri v Gabriel Matuszewski | 6-1,6-4 | |
| ITF - M25 Saraievo | 06/05 07:30 | 25 | Gabriel Matuszewski v Marino Jakic | 6-4,6-4 | |
| ITF - M25 Saraievo | 06/04 07:55 | 62 | Gabriel Matuszewski v Vanja Petrov | 6-2,6-4 | |
| ITF - M25 Saraievo | 06/03 11:30 | 62 | Gabriel Matuszewski v Emiliano Jorquera | 6-2,6-1 | |
| ITF M15 Bol | 05/28 08:00 | 62 | Sebastian Eriksson v Gabriel Matuszewski | 6-1,6-2 | |
| ITF M15 Bol | 05/27 07:30 | 62 | Filip Stidell v Gabriel Matuszewski | 7-5,3-6,6-10 | |
| ITF M15 Bol | 05/26 08:00 | 62 | Gabriel Matuszewski v Lawrence Bataljin | 4-6,7-5,10-5 | |
| ITF M15 Bol | 05/20 10:35 | 62 | David Schwarc v Gabriel Matuszewski | 7-6,6-3 | |
| ITF - M15 Prijedor | 05/14 14:00 | 44 | Tymur Bieldiugin v Gabriel Matuszewski | 7-6,6-0 | |
| ITF - M15 Prijedor | 05/13 12:00 | 44 | Ying Hou v Gabriel Matuszewski | 2-6,2-6 | |
| ITF - M15 Antália | 04/28 07:00 | 62 | Gabriel Matuszewski v Maximilian Figl | 7-5,3-6,5-10 | |
| ITF - M15 Antália | 04/21 07:00 | 62 | Gabriel Matuszewski v Dinko Dinev | 6-4,5-7,3-10 | |
| ITF - M15 Antália | 04/14 07:00 | 62 | Gabriel Matuszewski v Kanan Gasimov | 6-7,2-6 | |
| ITF - M15 Antália | 04/08 07:00 | 62 | Manuel Mazza v Gabriel Matuszewski | 6-1,6-4 | |
| ITF - M15 Antália | 04/01 09:50 | 62 | Maxim Zhukov v Gabriel Matuszewski | 7-5,7-6 | |
| ITF - M15 Antália | 03/31 07:00 | 62 | Gabriel Matuszewski v Alexander Grekul | Retired | |
| ITF - M15 Antália | 03/24 07:00 | 62 | Gabriel Matuszewski v Eero Vasa | 4-6,3-6 | |
| ITF - M15 Antália | 03/18 10:30 | 62 | Sergio Badini v Gabriel Matuszewski | 6-1,6-3 | |
| ITF - M15 Antália | 03/17 07:00 | 62 | Gabriel Matuszewski v Mert Alkaya | Retired | |
| ITF - M15 Antália | 03/12 09:10 | 62 | Gabriel Matuszewski v Louroi Martinez | 2-6,2-6 | |
| ITF - M15 Antália | 03/11 10:55 | 62 | Marsel Ilhan v Gabriel Matuszewski | 6-2,4-6,7-10 | |
| ITF - M15 Antália | 03/10 07:00 | 62 | Gabriel Matuszewski v Janis Graski | 6-1,1-6,10-4 | |
| ITF - M15 Antália | 03/04 09:40 | 62 | Gabriel Matuszewski v Anthony Genov | 2-6,3-6 | |
| ITF - M15 Antália | 03/03 07:00 | 62 | Gabriel Matuszewski v Lorenzo Bresciani | Retired | |
| ITF - M15 Antália | 02/27 06:30 | 62 | Gabriel Matuszewski v Andrea Fiorentini | 2-6,3-6 | |
| ITF - M15 Antália | 02/25 07:00 | 62 | Gabriel Matuszewski v Tobias Smoliner | 6-1,6-1 | |
| ITF - M25 Antalya | 02/19 07:00 | 62 | Gabriel Matuszewski v Lawrence Bataljin | 4-6,2-6 | |
| ITF - M25 Antalya | 02/18 07:00 | 62 | Bartlomiej Andrzejczak v Gabriel Matuszewski | 4-6,2-6 | |
| ITF - M25 Antalya | 02/12 10:35 | 62 | Attila Boros v Gabriel Matuszewski | 6-3,6-4 | |
| ITF - M25 Antalya | 02/11 07:00 | 62 | Gabriel Matuszewski v Dylan Salton | 6-4,6-4 |