Armenian boxer Arthur Abraham defeated American Raul Marquez by technical knockout after six rounds Saturday to defend his IBF middleweight boxing title for the eighth time and remain undefeated. Abraham landed two rights to Marquez’s right eye in the sixth round and the challenger’s camp called off the fight just before the seventh was due to start. "King Arthur" improved his record to 28-0 with 22 knockouts while Marquez dropped to 41-4-1 with 29 knockouts. Abraham came out more aggressive than usual in the first round and then connected on two heavy rights, a right-left combo and a flurry of hits in the third round. In the decisive sixth round, Abraham landed his two rights to Marquez’s head midway through the round and continued to take the initiative. After the sixth round the American sportsmen refused to continue the fight taking Abraham unawares. As a result Abraham once again became world champion.