Prizefighter series
On 18 December 2009, Sosnowski fought and defeated Paolo Vidoz for the EBU Heavyweight title, winning by unanimous decision. He was subsequently lined up to face heavyweight Prizefighter series winner and former Olympic gold medallist, Audley Harrison for his first defence of the title, with the fight being scheduled for 9 April 2010. He cancelled this fight for a shot at Vitali Klitschko for his WBC title.