 Poland: Szczecin - Doubles - Main |
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| Quarter-finals | Lenz J./Romboli F. | Kossek D./Kowalczyk M. | 2:0 (7:5, 7:5) | details | 12.09.2019 |
| 1/8-finals | Kossek D./Kowalczyk M. | Daniel T./Giustino L. | 2:0 (6:2, 6:1) | details | 11.09.2019 |
| Poland: Sopot - Doubles - Main |
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| Final | Begemann A./Mergea F. | Drzewiecki K./Kowalczyk M. | 2:1 (6:1, 3:6, 10:8) | details | 04.08.2019 |
| Semi-finals | Drzewiecki K./Kowalczyk M. | Gakhov I./Karatsev A. | 2:1 (4:6, 6:1, 10:7) | details | 03.08.2019 |
| Quarter-finals | Barranco Cosano J./Merino A. | Drzewiecki K./Kowalczyk M. | 1:2 (6:4, 61:7, 8:10) | details | 01.08.2019 |
| 1/8-finals | Drzewiecki K./Kowalczyk M. | Golubev A./Kolar Z. | 2:0 (7:5, 6:4) | details | 30.07.2019 |
 Czech Republic: Ostrava - Doubles - Main |
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| 1/8-finals | Gengel M./Satral J. | Kossek D./Kowalczyk M. | 2:0 (6:3, 7:5) | details | 01.05.2019 |
| Poland: Sopot - Doubles - Main |
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| Final | Kowalczyk M./Walkow S. | Gonzales R./Lammons N. | 2:0 (7:66, 6:3) | details | 05.08.2018 |
| Poland: Poznan - Doubles - Main |
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| Final | Kowalczyk M./Walkow S. | Balazs A./Vavassori A. | 2:1 (7:5, 68:7, 10:8) | details | 09.06.2018 |
| Semi-finals | Kowalczyk M./Walkow S. | Dembek M./Zielinski J. | 2:0 (7:65, 6:3) | details | 08.06.2018 |
| Quarter-finals | Laaksonen H./Panfil G. | Kowalczyk M./Walkow S. | 1:2 (5:7, 6:3, 8:10) | details | 07.06.2018 |
| 1/8-finals | Kowalczyk M./Walkow S. | Daniel T./Zapata Miralles B. | 2:0 (7:65, 6:1) | details | 06.06.2018 |
 World: Davis Cup - Group II - Doubles - Main |
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| | Bedene A./Rola B. | Kowalczyk M./Matkowski M. | 1:2 (7:5, 65:7, 4:6) | details | 04.02.2018 |
| World: Davis Cup - Group I - Doubles - Main |
|---|
| | Martin A./Zelenay I. | Kowalczyk M./Kubot L. | 1:3 (7:63, 3:6, 3:6, 2:6) | details | 16.09.2017 |
| Poland: Poznan - Doubles - Main |
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| 1/8-finals | Kowalczyk M./Mies A. | Kolar Z./Michnev P. | 0:2 (3:6, 5:7) | details | 18.07.2017 |
 Germany: Braunschweig - Doubles - Main |
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| Semi-finals | Kowalczyk M./Mies A. | Knowle J./Zelenay I. | 1:2 (65:7, 6:1, 8:10) | details | 14.07.2017 |
| Quarter-finals | Kowalczyk M./Mies A. | Behar A./Bury A. | 2:1 (6:2, 3:6, 10:8) | details | 13.07.2017 |
| 1/8-finals | Kowalczyk M./Mies A. | Junaid R./Margaroli L. | 2:0 (6:4, 6:1) | details | 11.07.2017 |
| Germany: Marburg - Doubles - Main |
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| Semi-finals | Junaid R./Roelofse R. | Kowalczyk M./Panfil G. | 2:1 (3:6, 6:4, 10:7) | details | 06.07.2017 |
| Quarter-finals | Kowalczyk M./Panfil G. | De Paula F./Galdos S. | 2:0 (7:64, 6:2) | details | 05.07.2017 |
| 1/8-finals | Giustino L./Motti A. | Kowalczyk M./Panfil G. | 0:2 (4:6, 1:6) | details | 03.07.2017 |
 Slovakia: Poprad - Doubles - Main |
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| Final | Kowalczyk M./Mies A. | Margaroli L./Weissborn S. | 2:0 (6:3, 7:63) | details | 24.06.2017 |
| Semi-finals | Arvidsson I./Simonsson F. | Kowalczyk M./Mies A. | 0:2 (2:6, 5:7) | details | 22.06.2017 |
| Quarter-finals | Kowalczyk M./Mies A. | Cacic N./Krajinovic F. | 2:1 (2:6, 6:4, 10:8) | details | 21.06.2017 |
| 1/8-finals | Kowalczyk M./Mies A. | Coria F./Velotti A. | 2:0 (6:2, 6:2) | details | 20.06.2017 |
 Portugal: Lisbon - Doubles - Main |
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| Quarter-finals | Balazs A./Borsos G. | Kowalczyk M./Panfil G. | 2:1 (4:6, 6:4, 10:6) | details | 15.06.2017 |
| 1/8-finals | Kowalczyk M./Panfil G. | Bangoura S./Margaroli L. | 2:1 (7:5, 5:7, 10:3) | details | 14.06.2017 |
 France: Bordeaux - Doubles - Main |
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| 1/8-finals | Kowalczyk M./Panfil G. | Bagnis F./Gonzalez M. | 0:2 (4:6, 63:7) | details | 15.05.2017 |
| Czech Republic: Ostrava - Doubles - Main |
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| 1/8-finals | Junaid R./Rosol L. | Kowalczyk M./Panfil G. | 2:0 (6:3, 6:1) | details | 03.05.2017 |
| Poland: Wroclaw - Doubles - Main |
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| Quarter-finals | Kowalczyk M./Panfil G. | Junaid R./Margaroli L. | 0:2 (5:7, 3:6) | details | 02.03.2017 |
| 1/8-finals | Behar A./Golubev A. | Kowalczyk M./Panfil G. | 0:2 (5:7, 3:6) | details | 01.03.2017 |
 Italy: Brescia - Doubles - Main |
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| Quarter-finals | Neuchrist M./Weissborn S. | Arends S./Kowalczyk M. | 2:1 (2:6, 6:4, 15:13) | details | 17.11.2016 |
| 1/8-finals | Arends S./Kowalczyk M. | Brunstrom J./Siljestrom A. | 2:0 (7:66, 7:61) | details | 16.11.2016 |
| Italy: Ortisei - Doubles - Main |
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| 1/8-finals | Dancevic F./Tepavac M. | Arends S./Kowalczyk M. | 2:0 (7:63, 7:5) | details | 08.11.2016 |
 Hungary: Budapest - Doubles - Main |
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| 1/8-finals | Arends S./Kowalczyk M. | Mektic N./Skugor F. | 0:2 (3:6, 3:6) | details | 26.10.2016 |
| France: Brest - Doubles - Main |
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| Final | Chiudinelli M./Vanni L. | Arends S./Kowalczyk M. | 1:2 (7:62, 3:6, 5:10) | details | 23.10.2016 |
| Semi-finals | Ghedin R./Marcan D. | Arends S./Kowalczyk M. | 0:2 (1:6, 4:6) | details | 21.10.2016 |
| Quarter-finals | Denolly C./Janvier M. | Arends S./Kowalczyk M. | WO. | details | 19.10.2016 |
| 1/8-finals | Jebavy R./Lacko L. | Arends S./Kowalczyk M. | 0:2 (3:6, 4:6) | details | 17.10.2016 |
| Slovakia: Trnava - Doubles - Main |
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| 1/8-finals | Ghem A./Kowalczyk M. | Bednarek T./Jebavy R. | 1:2 (2:6, 7:5, 2:10) | details | 11.08.2016 |
| Czech Republic: Liberec - Doubles - Main |
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| Semi-finals | Kowalczyk M./Majchrzak K. | Eysseric J./Ghem A. | 0:2 (3:6, 63:7) | details | 05.08.2016 |
| Quarter-finals | Kolar Z./Stanek R. | Kowalczyk M./Majchrzak K. | 0:2 (3:6, 2:6) | details | 04.08.2016 |
| 1/8-finals | Jebavy R./Suc D. | Kowalczyk M./Majchrzak K. | 0:2 (4:6, 3:6) | details | 02.08.2016 |
 Austria: Kitzbuhel - Doubles - Main |
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| 1/8-finals | Cervantes I./Kowalczyk M. | Cerretani J./Oswald P. | 1:2 (3:6, 7:63, 6:10) | details | 19.07.2016 |