[2] Before going pro in 2021, Ali Walsh spent a few months training alongside world-renowned boxing trainer, Abel Sanchez, in Big Bear Lake, California.
[3][4][2][5] Walsh made his professional debut against Jordan Weeks on the Joshua Franco vs. Andrew Moloney III undercard, on August 14, 2021.
[7] Walsh was booked to face James Westley II, in his second professional bout, on October 23, 2021, on the undercard of the WBO super featherweight championship between Shakur Stevenson and Jamel Herring.
[11] Walsh faced Jeremiah Yeager on January 29, 2022, on the undercard of the WBC super featherweight title eliminator between Robson Conceição and Xavier Martinez.
[12] Walsh faced Alejandro Ibarra on April 30, 2022, on the undercard of the WBC and WBO super featherweight unification between Shakur Stevenson and Óscar Valdez.