| ITF - Sharm El Sheikh M15 | 12/13 12:05 | 25 | Karol Drzewiecki v Bor Artnak | 3-6,4-6 | |
| ITF - Wrocław M15 | 06/28 09:40 | 25 | [110] Karol Drzewiecki v Sergey Fomin [325] | 3-6,6-2,1-6 | |
| ITF - Wrocław M15 | 06/26 14:15 | 62 | Karol Drzewiecki v Alex Bancila | 6-1,6-3 | |
| ITF - Wrocław M15 | 06/26 09:00 | 62 | Karol Drzewiecki v Tanguy Genier | 6-4,6-7,11-9 | |
| ITF - Wrocław M15 | 06/25 11:30 | 62 | Karol Drzewiecki v Mateusz Kulakowski | 6-4,6-2 | |
| Challenger Skopje | 05/23 12:30 | 25 | [130] Karol Drzewiecki v Roman A Burruchaga [251] | 5-7,0-6 | |
| Challenger Skopje | 05/22 09:00 | 19 | Karol Drzewiecki v Obrad Markovski | 6-2,7-5 | |
| Challenger Skopje | 05/21 09:00 | 14 | Karol Drzewiecki v Besir Durguti | 6-2,6-1 | |
| Challenger Ostrava | 04/23 14:35 | 14 | [125] Karol Drzewiecki v Filip Peliwo [358] | 1-6,6-3,6-7 | |
| Challenger Biel | 03/20 13:45 | - | Karol Drzewiecki v Kirill Kivattsev | 4-6,3-6 | |
| Challenger Biel | 03/19 17:30 | 14 | [414] Ramkumar Ramanathan v Karol Drzewiecki [128] | 4-6,7-5,2-6 | |
| Challenger Concepcion | 01/23 14:00 | 19 | [280] Juan Bautista Torres v Karol Drzewiecki [128] | 6-1,2-6,6-2 | |
| Challenger Concepcion | 01/22 15:30 | 14 | [128] Karol Drzewiecki v Yunseong Chung [335] | 6-3,6-2 | |
| Challenger Guayaquil | 10/31 16:25 | 14 | Karol Drzewiecki v Colin Markes | 4-6,6-4,6-7 | |
| Challenger Coquimbo | 10/16 18:00 | 14 | Karol Drzewiecki v Sumit Nagal | 3-6,2-6 | |
| Challenger Rio de Janeiro | 10/09 16:05 | 14 | [393] Juan Pablo Paz v Karol Drzewiecki [157] | 7-5,7-6 | |
| Challenger Szczecin | 09/11 12:55 | 14 | [150] Karol Drzewiecki v Andrew Paulson [405] | 2-6,0-6 | |
| Challenger Tuluza | 08/30 14:30 | 25 | [351] Arthur Fils v Karol Drzewiecki [150] | 7-6,6-1 | |
| Challenger Tuluza | 08/29 11:25 | 19 | [150] Karol Drzewiecki v Malek Jaziri [422] | 7-6,3-6,6-4 | |
| Challenger Tuluza | 08/28 15:25 | 14 | [152] Karol Drzewiecki v Patrik Niklas-Salminen [199] | 6-2,6-3 | |
| Challenger Mouilleron le Captif | 10/03 12:30 | 26 | Karol Drzewiecki v Szymon Walkow | 3-6,6-7 | |
| Challenger Szczecin | 09/12 14:45 | 14 | [156] Karol Drzewiecki v Bogdan Bobrov [452] | 2-6,4-6 | |
| Challenger Cherbourg | 02/07 09:30 | 14 | [351] Vladyslav Orlov v Karol Drzewiecki [156] | 6-3,6-2 | |
| Polska - National Tour | 08/15 11:15 | - | Karol Drzewiecki v Piotr Galus | Retired | |
| Polska - National Tour | 07/24 09:00 | 1 | Karol Drzewiecki v Filip Kolasinski | 1-6,1-6 | |
| Polska - National Tour | 06/21 10:55 | - | Karol Drzewiecki v Kamil Gajewski | Retired | |
| Polska - National Tour | 06/17 13:57 | - | Pawel Cias v Karol Drzewiecki | 0-0 | |
| Polska - National Tour | 06/17 07:00 | 1 | Karol Drzewiecki v Piotr Galus | 6-1,7-5 | |
| ITF - Palm Coast M25 | 02/03 18:00 | 54 | Jaume Pla Malfeito v Karol Drzewiecki | 6-4,6-3 | |
| ITF - Weston M25 | 01/28 14:00 | 44 | [238] Alejandro Gomez v Karol Drzewiecki [206] | 7-5,6-3 |