Former British world champion Lennox Lewis has said his heart wants compatriot David Haye to win Saturday\'s unification bout, but his head says Wladimir Klitschko will be victorious. Lewis retired in 2003 having beaten elder Klitschko brother Vitali in a career which saw him knock-out legend Mike Tyson in June 2002 and hold both the WBC and IBF belts. The 45-year-old says Wladimir Klitschko has a better jab than Haye, a wealth of experience and in Emanuel Steward, one of boxing\'s top coaches in his corner, but Haye can cause him problems. \"My heart says David, but my head says Wladimir,\" Lewis told Boxing website Boxrec.com. \"The reason is because Wladmir has a good jab, good experience and a great trainer in his corner. \"However, if there is one fighter who can unsettle him - and he has done already with what he\'s been saying - it\'s David Haye. \"David has the talent and the punch power to knock him out. \"And to win I think he has to knock him out. If it goes to the judges, Wladimir will win the fight.\" The 35-year-old Klitschko has an impressive record of 49 knock-outs from 58 fights, with just three defeats, and he insists Haye, 30, will be his 50th KO. This will be only Haye\'s fifth heavyweight fight since stepping up from cruiserweight in 2008 and although he has a record of 25 wins with 23 knock-outs from 26 fights, most of those came at the lighter weight. Haye\'s team have complained about the proposed referee for the bout - Genaro Hernandez - who has overseen four of Klitschko\'s world title bouts, including his 2003 loss to Corrie Sanders, and Lewis says they are right to object. \"As far as the referee goes, I would be doing exactly the same as Haye,\" said Lewis. \"But David Haye should allow his own judges - his fists - to decide the fight.\"