Oihane Unanue/Mikel Unanue (San-Sebastian, ESP) qualified for the 2021 Oberstdorf International Mixed Doubles Cup playoffs, dropping their quarterfinals match 6-3 against Daniela Rupp/Kevin Wunderlin (Zug, SUI).
 
Unanue/Unanue finished 3-0 in the 16-team qualifying round. . In their opening game, Unanue/Unanue defeated Zuzanna Rybicka/Bartosz Dzikowski (Lodz, POL) 8-4, then won 8-3 against Natalie Wiksten/Kasper Wiksten (Hvidovre, DEN) and 10-1 against Johanna Heldin/Daniel Magnusson (Uppsala, SWE) in their final qualifying round match.
 
. For week 6 of the event schedule, Unanue/Unanue did not improve upon their best events, remaining at 778th place on the World Ranking Standings with 55.150 total points. Unanue/Unanue ranks 341st overall on the Year-to-Date rankings with 0.000 points earned so far this season.