The 25-year-old will take on fellow Kiwi, David Light, in Auckland tonight for the WBO Cruiserweight Oriental belt, with the winner likely to get a top five ranking and a shot at a world title fight in 2021.
Naturally a super middleweight, Auimatagi is embracing the chance to fight two divisions up.
"I've been here before. I've been the underdog, I've fought guys who are undefeated before so I'm prepared for this fight coming up," he said.
Auimatagi who trains out of Papatoetoe Boxing Club, has a 13 win 1 loss record, while Light is 15 and 0.
