Daniela Rupp/Kevin Wunderlin (Zug, SUI) won 11-1 over Zuzanna Rybicka/Bartosz Dzikowski (Lodz, POL) in the Bronze Medal game at the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany. of the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany; Daniela Rupp/Kevin Wunderlin (Zug, SUI) won 11-1 over Zuzanna Rybicka/Bartosz Dzikowski (Lodz, POL) in the Bronze Medal game at the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany. Rupp/Wunderlin lost 7-6 to Adela Walczak/Andrzej Augustyniak (Lodz, POL) in the semifinals to drop into the third place game. of the 2021 Oberstdorf International Mixed Doubles Cup in Oberstdorf, Germany; and won 6-3 over Oihane Unanue/Mikel Unanue (San-Sebastian, ESP) in the quarterfinals.
 
Rupp/Wunderlin finished 3-2 in the 16-team qualifying round. . In their opening game, Rupp/Wunderlin lost 7-5 to Walczak/Augustyniak, then responded with a 10-1 win over Julie Zelingrova/Vitek Chabicovsky (Prague, CZE). Rupp/Wunderlin went on to lose 10-9 against Marie Kaldvee/Harri Lill (Tallinn, EST). Rupp/Wunderlin responded with a 9-0 win over Lisenka Bomas/Bob Bomas (Zoetermeer, NED). Rupp/Wunderlin won 6-1 against Lea Hueppi/Jonas Weiss (Kusnacht, SUI) in their final qualifying round match.
 
. For week 6 of the event schedule, Rupp/Wunderlin did not improve upon their best events, remaining at 778th place on the World Ranking Standings with 209.178 total points. Rupp/Wunderlin ranks 312th overall on the Year-to-Date rankings with 0.000 points earned so far this season.