On April 3, 2013, Golden Boy Promotions confirmed that Wilder would fight former European heavyweight champion and 2000 Olympic gold medalist Audley Harrison (31-6, 23 KOs) at the Motorpoint Arena in Sheffield, his UK debut, on April 27. Harrison was coming into this fight looking to rebuild after winning the prizefighter heavyweight tournament two months earlier. The card, which was being shown live on Showtime in USA, was headlined by Amir Khan's return in the UK against Julio Díaz. Harrison informed the boxing world that he would retire if he lost. Wilder knocked out Harrison in round 1. Wilder found an opening 49 seconds into the opening round and caught Harrison with a big right hand that rocked him back into the ropes. A follow up barrage from Wilder sent Harrison into the corner, crumpling onto the floor. Harrison used the ropes to get to his feet at the count of eight, but referee Terry O'Connor waved an end to the bout. The official time of stoppage was 1:22 of the first round. Four days after the fight, Harrison announced his retirement at the age of 41 years.