As an amateur, he won a gold medal while representing Australia at the 2011 Commonwealth Youth Games.

In 2011, Lewis competed and won gold for Australia at the 2011 Commonwealth Youth Games in the light-welterweight division, winning the final with a score of 27–24.

[3] Lewis finished in sixth place in the boxing men's welterweight at the 2014 Commonwealth Games.

Lewis was ruled out of his welterweight quarter-final bout against Indian boxer Mandeep Jangra by medical staff after suffering a cut above the eye during his second round – round of 16 – unanimous points win over Nigeria's Kehinde Ademuyiwa.

[8] Lewis made his pro-boxing debut on 23 May 2019 at the Wildfighter boxing event presented by Will Tomlinson in Melbourne, Australia where he scored the second round knockout win against Sanong Seepongsert of Thailand.