To start off the year, Diakomihalis wrestled two-time and reigning Pan American champion (70kg) Anthony Ashnault on January 8, at the SCRTC I. After scoring two two-point takedowns and a step-out, he scored a five-point slam, driving Ashnault to a technical fall. Diakomihalis then competed at the Henri Deglane Grand Prix of France on January 16. After advancing to the semifinals with two wins, Diakomihalis faced World and Olympic champion Vladimer Khinchegashvili in a rematch from their BTS match, and was able to avenge his lone 2020 loss when he dominantly tech'd the Geogian, advancing to the finals, where he flawlessly defeated James Green, in a rubber match from their series at the RTC Cup, to claim gold.