Adela Walczak/Andrzej Augustyniak (Lodz, POL) lost 8-5 to Johanna Heldin/Daniel Magnusson (Uppsala, SWE) in the Final of the Oberstdorf International Mixed Doubles Cup, held September 3 - 5, 2021 in Oberstdorf, Germany. To advance to the championship game, Walczak/Augustyniak won 7-6 over Daniela Rupp/Kevin Wunderlin (Zug, SUI) in the semifinals of the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany; and won 10-8 over Katja Schlegel/Sebastian Keiser (Zug, SUI) in the quarterfinals. of the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany;
 
Walczak/Augustyniak finished 3-1 in the 16-team qualifying round. . In their opening game, Walczak/Augustyniak defeated Rupp/Wunderlin 7-5, then won 6-5 against Martine Ronning/Mathias Braenden (Lillehammer, NOR). Walczak/Augustyniak went on to lose 7-3 against Pia-Lisa Schoell/Klaudius Harsch (Fuessen, GER). Walczak/Augustyniak responded with a 7-3 win over Marie Kaldvee/Harri Lill (Tallinn, EST) in their final qualifying round match.
 
. For week 6 of the event schedule, Walczak/Augustyniak did not improve upon their best events, remaining at 778th place on the World Ranking Standings with 19.138 total points. Walczak/Augustyniak ranks 284th overall on the Year-to-Date rankings with 0.000 points earned so far this season.