Wladimir Klitschko and Alex Leapai held their open workout at the Centro shopping centre in Oberhausen (Germany). About 3000 fans showed up to watch both fighters showing off their boxing skills in preparation for their heavyweight championship fight this Saturday, April 26. IBF, WBA, WBO, IBO and “Ring Magazine” Champion Klitschko and his contender Alex Leapai will face off at the König-Pilsener-Arena Oberhausen, Germany.