Canadian Stiverne, the WBC's number-one ranked contender to Vitali Klitschko before the Ukrainian stepped away from boxing this week, claimed a unanimous decision over American Arreola in April.Arreola dropped Seth Mitchell in September inside the opening round to bounce back from the defeat and establish himself as the body's number two challenger.The duo will meet again after their warmly-received first encounter, with Vitali's brother Wladimir - who holds every other recognised world heavyweight title - waiting in the wings after declaring his intention to unify the division shortly after his older brother decided to focus on politics.Other heavyweights hoping to be in contention for the vacated belt included British fighters Tyson Fury and Dereck Chisora, and unbeaten American Deontay Wilder.(uk.eurosport.yahoo.com)ANN.Az