 Poland: M25 Poznan - Doubles - Main |
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| Final | Lorens M./Marek W. | Zielinski J./Zuk K. | 0:2 (5:7, 2:6) | details | 29.08.2020 |
| Semi-finals | Dembek M./Wojcik Y. | Zielinski J./Zuk K. | 0:2 (5:7, 3:6) | details | 28.08.2020 |
| Quarter-finals | Matuszewski P./Podzus M. | Zielinski J./Zuk K. | 0:2 (1:6, 3:6) | details | 27.08.2020 |
| 1/8-finals | Brouwer G./Sels J. | Zielinski J./Zuk K. | 1:2 (2:6, 6:3, 6:10) | details | 26.08.2020 |
 United Kingdom: M25 Barnstaple - Doubles - Main |
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| Final | Hoyt E./Johnson L. | Zielinski J./Zuk K. | 0:2 (3:6, 65:7) | details | 15.02.2020 |
| Semi-finals | Lemstra K./Marek W. | Zielinski J./Zuk K. | 0:2 (0:6, 1:6) | details | 14.02.2020 |
| Quarter-finals | Matusevich A./Phillips M. | Zielinski J./Zuk K. | WO. | details | 13.02.2020 |
| 1/8-finals | Davies G./Jones A. | Zielinski J./Zuk K. | 0:2 (2:6, 2:6) | details | 11.02.2020 |
 Germany: M25 Nussloch - Doubles - Main |
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| Final | Haerteis J./Heller P. | Zielinski J./Zuk K. | 0:2 (3:6, 4:6) | details | 25.01.2020 |
| Semi-finals | Nijboer R./Smits G. | Zielinski J./Zuk K. | 0:2 (4:6, 63:7) | details | 23.01.2020 |
| Quarter-finals | Hermans M./Stevens B. | Zielinski J./Zuk K. | 0:2 (4:6, 5:7) | details | 22.01.2020 |
| 1/8-finals | Satral J./Stanek R. | Zielinski J./Zuk K. | 1:2 (6:2, 2:6, 7:10) | details | 21.01.2020 |
| Poland: Szczecin - Doubles - Main |
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| Quarter-finals | Middelkoop M./Podlipnik-Castillo H. | Zielinski J./Zuk K. | 2:0 (6:4, 7:5) | details | 12.09.2019 |
| 1/8-finals | Zielinski J./Zuk K. | Gakhov I./Kopriva V. | 2:0 (7:68, 6:2) | details | 11.09.2019 |
| Poland: Sopot - Doubles - Main |
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| 1/8-finals | Brkic T./Pavic A. | Zielinski J./Zuk K. | 2:1 (4:6, 6:1, 10:8) | details | 30.07.2019 |
 Czech Republic: Prague - Doubles - Main |
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| 1/8-finals | Draganja T./Milojevic N. | Zielinski J./Zuk K. | 2:1 (3:6, 6:3, 10:7) | details | 23.07.2019 |
