On September 17, 2020, in the Stadio Olimpico in Rome Kendziera ran 49.35 placing him in the top ten for the year worldwide.[11]
On June 26, 2021, the Mount Prospect, IL native qualified for the Tokyo Olympics in the 400m hurdles after setting a personal record of 48.38 seconds and placing third in the finals at the US Olympic Trials.
[12]
On July 29, 2021, Kendziera placed fourth in the 400m hurdles quarterfinals in the Tokyo Olympics and qualified for the semi-finals.[13]