12.09.19 | 1/4 | Julian Lenz/Fernando Romboli | Daniel Kossek/Mateusz Kowalczyk | 7-5, 7-5 |  | match details | Szczecin Challenger | Clay |
11.09.19 | 1st round | Daniel Kossek/Mateusz Kowalczyk | Taro Daniel/Lorenzo Giustino | 6-2, 6-1 |  | match details |
02.09.19 | 1/4 | Petr Nouza/Michael Vrbensky | Daniel Kossek/Mateusz Kowalczyk | 3-6, 6-3, 10-5 |  | match details | M15 Szekesfehervar | Clay |
02.09.19 | 1st round | Daniel Kossek/Mateusz Kowalczyk | Genaro Alberto Olivieri/Camilo Ugo Carabelli | 6-4, 4-6, 10-6 |  | match details |
12.08.19 | 1st round | Adam Taylor/Jason Taylor | Daniel Kossek/Mateusz Kowalczyk | 7-65, 3-6, 10-7 |  | match details | M25+H Bydgoszcz | Clay |
20.05.19 | 1/4 | Daniel Kossek/Mateusz Kowalczyk | Sarp Agabigun/Marsel Ilhan | 6-3, 6-2 |  | match details | M15 Antalya | Clay |
20.05.19 | 1/2 | Denys Klok/Vladimir Korolev | Daniel Kossek/Mateusz Kowalczyk | 6-3, 4-6, 10-6 |  | match details |
20.05.19 | 1st round | Daniel Kossek/Mateusz Kowalczyk | Kaya Arinc/Kuzey Cekirge | 6-0, 6-1 |  | match details |
01.05.19 | 1st round | Marek Gengel/Jan Satral | Daniel Kossek/Mateusz Kowalczyk | 6-3, 7-5 |  | match details | Ostrava Challenger | Clay |