proposed matches with Samuel Peter and Martin Rogan fell through, on 6 September 2008 Harrison gained what the BBC described as "an unconvincing victory" over George Arias at the MEN Arena in Manchester. The fight was overshadowed by Amir Khan's first defeat later on the same card. On 6 December 2008, Harrison's career seemed all but over as he was defeated by the winner of the first Prizefighter tournament and Belfast taxi driver, Martin Rogan. The referee scored the contest 96–95 in favour of the Irishman. Comeback Harrison signed for the Prizefighter tournament, an eight-man, one-night knockout tournament that took place at ExCeL London on 2 October 2009. On 1 October 2009, he weighed in for Prizefighter at 18 stones and half a pound. He went on to win the tournament, by way of second round knock-out against Coleman Barrett. Before that, he had knocked out Scott Belshaw and won a unanimous decision over Danny Hughes. Following his success in the Prizefighter tournament, it was announced on 15 January 2010 that Harrison would face Albert Sosnowski for the European Boxing Union heavyweight title, with the fight set for 9 April 2010. However Sosnowski called the bout off for a shot at Vitali Klitschko's WBC title. On 9 April 2010, Harrison won the vacant EBU belt against old foe Michael Sprott at Alexandra Palace. He knocked out Sprott in the final round despite being behind on all three judges scorecards. Harrison claimed he sustained a shoulder injury early in the fight and had to carry on single-handed. BBC Sport said of the fight: "Having come within seconds of a defeat that would have made a mockery of pre-fight assertions that he could face one of the Klitschko brothers for a world title, Harrison said: 'I had to win it somehow. On 24 April 2010, Harrison underwent surgery in Cheadle, Greater Manchester to repair the torn Pectoralis major muscle. The surgeon said he expected Harrison to make a "full recovery in about 12 to 16 weeks". World title challenge vs. David Haye On 8 June 2010, Harrison vacated his European title, announcing his intention of getting a world title shot. He began negotiations with Hayemaker Promotions soon after, which culminated in a world-title fight in the M.E.N. Arena against WBA champion David Haye on 13 November 2010. Harrison was defeated by Haye, with the fight being stopped in the third round after