Klitschko hasn't suffered defeat since losing to Lamon Brewster in 2004, but after he earned his opportunity with a points win over Denis Boytsov, Leapai is eager to make sure that his journey to fight for a world belt isn't a wasted one.
The 34-year-old told reporters: "I'm here to make history. I want people in 100 years to remember that a Samoan-born Aussie came out of nowhere to beat one of the best heavyweights of all time.
"It's been a long road to get to this stage but I will make sure that the long ride has been worth it."
Leapai has won 30 of 37 professional encounters, while Klitschko has 61 wins from 64 matches.