In pictures: Wladimir Klitschko trains for fight inside a German mall

World Champion Wladimir Klitschko of Ukraine exercises during the official training session ahead of his IBF, WBA, WBO and IBO World Championship fight against challenger Alex Liapai on April 23, 2014 in Oberhausen, Germany. Dennis Grombkowski/Getty Images

Australian heavyweight boxer Alex Leapai takes part in a public training session in Centro in Oberhausen, Germany on April 23, 2014. Leapai will challenge WBO, IBF, WBA and IBO heavyweight champion Wladimir Klitschko. EPA/CAROLINE SEIDEL

Challenger Alex Leapai during the official training session ahead of his IBF, WBA, WBO and IBO World Championship fight against World Champion Wladimir Klitschko of Ukraine on April 23, 2014 in Oberhausen, Germany. Dennis Grombkowski/Getty Images

World heavyweight boxing champion Wladimir Klitschko of Ukraine and challenger Alex Leapai of Australia work out during their official training session – inside a mall in Oberhausen, Germany – ahead of their IBF, WBA, WBO and IBO World Championship fight, which is scheduled for Sunday, April 27. It is the first time in 106 years an Australian, albeit a Samoan-born one, has lined up for a shot at the World Heavyweight title. But Leapai will have to do it the hard way against Klitschko, who has the edge over his opponent in age, weight, reach and experience.