[10] His second-place finish, and time trial performance qualified him to represent the United States at the 2020 Olympic Games.

[12] In the prelims heats, he swam a time of 3:45.38 to qualify for the final ranking seventh, just 0.07 seconds behind sixth-ranked swimmer and teammate Kieran Smith.

[16] For the prelims heats of the 400 yard individual medley on day three, Mitchell ranked fourth with a time of 3:45.92 and qualified for the final.

[20][21] Less than one week later, Mitchell placed second in the 400 meter freestyle at the Westmont, Illinois stop of the 2022 Pro Swim Series with a time of 3:51.12.

[22] The next morning, he qualified for the final of the 200 meter freestyle with a time of 1:50.86, ranking third overall 0.28 seconds behind first-ranked Patrick Callan.

[27] On December 2, he won the gold medal in the 200 meter freestyle, finishing 0.77 seconds ahead of silver medalist Zane Grothe with a time of 1:47.38.