[2] He competed at the 2017 National Championships in the 15-16 age division; he placed fifth in the all-around and fourth on floor exercise.

[4] Walker competed at the RD761 International Junior Team Cup where he helped the USA win silver.

[10] At the 2021 U.S. National Championships Walker placed 12th in the all-around but won bronze on the parallel bars behind Yul Moldauer and Shane Wiskus.

[16] In June Walker was selected to represent the United States at the Pan American Championships alongside Riley Loos, Brody Malone, Yul Moldauer, and Shane Wiskus.

[17] On the first day of competition Walker competed on floor exercise, pommel horse, vault, and parallel bars to help qualify the United States in first place to the team final.

[19] In late July Walker competed at the U.S. Classic where he placed second in the all-around behind Stanford teammate Malone with a score of 85.264 (83.750 without bonus).

[20] In August Walker competed at the U.S. National Championships where he finished sixth in all-around but recorded the second highest score when removing domestic bonuses.

[21] In October Walker was named to the team to compete at the 2022 World Championships alongside Asher Hong, Brody Malone, Stephen Nedoroscik, and Donnell Whittenburg.

[28] The following day he was named as the alternate for the World Championships team and was named to the team to compete at the Pan American Games taking place in late October alongside Donnell Whittenburg, Shane Wiskus (later replaced by Curran Phillips), Stephen Nedoroscik, and Cameron Bock.

[30] At the Pan American Games Walker helped the United States win team gold.

[34] At the Championships Walker contributed scores on all apparatuses except pommel horse and helped Stanford win their fifth consecutive team title.