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