09.11.21 | 1st round | Milos Karol/Lukas Pokorny | Szymon Walkow/Jan Zielinski | 2-6, 6-3, 10-5 | | match details | Bratislava Challenger | I. hard |
05.11.21 | 1/2 | Ruben Bemelmans/Daniel Masur | Szymon Walkow/Jan Zielinski | 7-63, 7-5 | | match details | Eckental Challenger | Carpet |
04.11.21 | 1/4 | Szymon Walkow/Jan Zielinski | Alexander Cozbinov/Maxime Cressy | 6-4, 6-72, 10-7 | | match details |
03.11.21 | 1st round | Szymon Walkow/Jan Zielinski | Julian Lenz/Tristan-Samuel Weissborn | 4-6, 6-4, 10-7 | | match details |
29.10.21 | 1/2 | Andre Begemann/Igor Zelenay | Szymon Walkow/Jan Zielinski | 6-4, 1-6, 10-7 | | match details | Ismaning Challenger | Carpet |
28.10.21 | 1/4 | Szymon Walkow/Jan Zielinski | Julian Lenz/Tristan-Samuel Weissborn | 7-63, 6-4 | | match details |
27.10.21 | 1st round | Szymon Walkow/Jan Zielinski | Jeevan Nedunchezhiyan/Purav Raja | 7-5, 7-610 | | match details |
06.10.21 | 1st round | Titouan Droguet/Harold Mayot | Szymon Walkow/Jan Zielinski | 6-4, 6-4 | | match details | Mouilleron Le | I. hard |
01.10.21 | 1/4 | Nathaniel Lammons/David Pel | Szymon Walkow/Jan Zielinski | 7-5, 7-65 | | match details | Orleans Challenger | I. hard |
29.09.21 | 1st round | Szymon Walkow/Jan Zielinski | Arthur Fils/Giovanni Mpetshi Perricard | 6-3, 6-4 | | match details |
16.09.21 | 1st round | Szymon Walkow/Jan Zielinski | Luca Margaroli/David Vega Hernandez | 6-3, 6-4 | | match details | Szczecin Challenger | Clay |
16.09.21 | 1/4 | Andre Goransson/Nathaniel Lammons | Szymon Walkow/Jan Zielinski | 6-74, 6-3, 10-0 | | match details |
14.08.21 | fin | Szymon Walkow/Jan Zielinski | Dustin Brown/Robin Haase | 6-3, 6-1 | | match details | Meerbusch Challenger | Clay |
13.08.21 | 1/2 | Szymon Walkow/Jan Zielinski | Jesper De Jong/Bart Stevens | 6-2, 6-72, 11-9 | | match details |
12.08.21 | 1/4 | Szymon Walkow/Jan Zielinski | Ivan Sabanov/Matej Sabanov | 7-65, 6-4 | | match details |
11.08.21 | 1st round | Szymon Walkow/Jan Zielinski | Juan Pablo Ficovich/Nicolas Kicker | 6-3, 6-2 | | match details |
29.07.21 | 1/4 | Ruben Gonzales/Hunter Johnson | Szymon Walkow/Jan Zielinski | 2-6, 7-66, 13-11 | | match details | Poznan Challenger | Clay |
28.07.21 | 1st round | Szymon Walkow/Jan Zielinski | Joao Domingues/Gastao Elias | 6-2, 6-2 | | match details |
25.07.21 | fin | Marc-Andrea Huesler/Dominic Stricker | Szymon Walkow/Jan Zielinski | 6-1, 7-67 | | match details | Gstaad | Clay |
23.07.21 | 1/2 | Szymon Walkow/Jan Zielinski | Jakub Paul/Leandro Riedi | 4-6, 7-63, 10-2 | | match details |
22.07.21 | 1/4 | Szymon Walkow/Jan Zielinski | Dustin Brown/Tristan-Samuel Weissborn | 6-4, 6-77, 10-7 | | match details |
21.07.21 | 1st round | Szymon Walkow/Jan Zielinski | Sander Arends/David Pel | 7-64, 0-0, Sander Arends/David Pel - retired | | match details |
10.07.21 | fin | Szymon Walkow/Jan Zielinski | Ivan Sabanov/Matej Sabanov | 6-4, 4-6, 10-4 | | match details | Braunschweig Challenger | Clay |
09.07.21 | 1/2 | Szymon Walkow/Jan Zielinski | Fernando Romboli/David Vega Hernandez | Fernando Romboli/David Vega Hernandez - walk over | | match details |
08.07.21 | 1/4 | Szymon Walkow/Jan Zielinski | Guillermo Duran/Tim Sandkaulen | 7-5, 6-4 | | match details |
07.07.21 | 1st round | Szymon Walkow/Jan Zielinski | James Cerretani/Igor Zelenay | 6-3, 6-4 | | match details |
25.06.21 | 1/2 | Dustin Brown/Tristan-Samuel Weissborn | Szymon Walkow/Jan Zielinski | 7-5, 6-4 | | match details | Milan Challenger | Clay |
24.06.21 | 1/4 | Szymon Walkow/Jan Zielinski | Riccardo Bonadio/Teimuraz Gabashvili | 6-2, 6-1 | | match details |
23.06.21 | 1st round | Szymon Walkow/Jan Zielinski | Raul Brancaccio/Giulio Zeppieri | 7-63, 6-4 | | match details |
18.06.21 | 1/2 | Sadio Doumbia/Fabien Reboul | Szymon Walkow/Jan Zielinski | 7-66, 6-4 | | match details | Aix En | Clay |
17.06.21 | 1/4 | Szymon Walkow/Jan Zielinski | Tristan Lamasine/Albano Olivetti | 6-4, 7-5 | | match details |
16.06.21 | 1st round | Szymon Walkow/Jan Zielinski | Rafael Matos/Denys Molchanov | 6-0, 6-75, 10-8 | | match details |
11.06.21 | 1/2 | Martin Cuevas/Pablo Cuevas | Szymon Walkow/Jan Zielinski | 7-65, 6-71, 10-8 | | match details | Lyon Challenger | Clay |
10.06.21 | 1/4 | Szymon Walkow/Jan Zielinski | Ugo Blanchet/Kyrian Jacquet | 7-63, 6-2 | | match details |
08.06.21 | 1st round | Szymon Walkow/Jan Zielinski | Karol Drzewiecki/Sergio Martos Gornes | 4-6, 7-5, 10-7 | | match details |
14.05.21 | 1/4 | Szymon Walkow/Jan Zielinski | Jason Jung/Go Soeda | 6-3, 6-4 | | match details | Zagreb Challenger | Clay |
14.05.21 | 1/2 | Andrey Golubev/Aleksandr Nedovyesov | Szymon Walkow/Jan Zielinski | 7-65, 6-4 | | match details |
12.05.21 | 1st round | Szymon Walkow/Jan Zielinski | Daniil Golubev/Evgenii Tiurnev | 6-0, 6-2 | | match details |
04.05.21 | 1st round | Ivan Sabanov/Matej Sabanov | Szymon Walkow/Jan Zielinski | 3-6, 6-3, 10-5 | | match details | Prague Challenger | Clay |
17.04.21 | fin | Szymon Walkow/Jan Zielinski | Gregoire Barrere/Albano Olivetti | 6-2, 7-5 | | match details | Split 2 | Clay |
16.04.21 | 1/2 | Szymon Walkow/Jan Zielinski | Andrey Golubev/Aleksandr Nedovyesov | 6-3, 7-61 | | match details |
15.04.21 | 1/4 | Szymon Walkow/Jan Zielinski | Duje Ajdukovic/Frane Nincevic | 6-0, 6-4 | | match details |
14.04.21 | 1st round | Szymon Walkow/Jan Zielinski | Purav Raja/Tristan-Samuel Weissborn | 6-3, 6-4 | | match details |
10.04.21 | fin | Andrey Golubev/Aleksandr Nedovyesov | Szymon Walkow/Jan Zielinski | 7-5, 6-75, 10-5 | | match details | Split 1 | Clay |
09.04.21 | 1/2 | Szymon Walkow/Jan Zielinski | Albano Olivetti/Matt Reid | 6-4, 6-4 | | match details |
08.04.21 | 1/4 | Szymon Walkow/Jan Zielinski | Robert Galloway/Alex Lawson | 7-5, 7-66 | | match details |
07.04.21 | 1st round | Szymon Walkow/Jan Zielinski | Sadio Doumbia/Fabien Reboul | 6-3, 6-2 | | match details |
26.03.21 | 1/2 | Denys Molchanov/Sergiy Stakhovsky | Szymon Walkow/Jan Zielinski | 4-6, 7-63, 10-4 | | match details | Lugano Challenger | I. hard |
25.03.21 | 1/4 | Szymon Walkow/Jan Zielinski | Purav Raja/Tristan-Samuel Weissborn | 6-4, 6-2 | | match details |
24.03.21 | 1st round | Szymon Walkow/Jan Zielinski | Luca Margaroli/Jack Sock | 7-62, 6-76, 10-3 | | match details |
12.03.21 | 1/2 | Denys Molchanov/Sergiy Stakhovsky | Szymon Walkow/Jan Zielinski | 7-64, 7-65 | | match details | Biella 3 | I. hard |
11.03.21 | 1/4 | Szymon Walkow/Jan Zielinski | Daniel Masur/Jurij Rodionov | 6-2, 6-2 | | match details |
10.03.21 | 1st round | Szymon Walkow/Jan Zielinski | Benjamin Hassan/Ryan Peniston | Benjamin Hassan/Ryan Peniston - walk over | | match details |
13.02.21 | fin | Luis David Martinez/David Vega Hernandez | Szymon Walkow/Jan Zielinski | 6-4, 3-6, 10-8 | | match details | Biella 1 | I. hard |
12.02.21 | 1/2 | Szymon Walkow/Jan Zielinski | Robert Galloway/Alex Lawson | 6-4, 6-75, 10-6 | | match details |
11.02.21 | 1/4 | Szymon Walkow/Jan Zielinski | Luca Margaroli/Andrei Vasilevski | 6-2, 7-5 | | match details |
10.02.21 | 1st round | Szymon Walkow/Jan Zielinski | Daniele Augenti/Massimo Giunta | 6-1, 6-3 | | match details |