Adonis Stevenson produced a chilling first-round knockout to take Chad Dawson's WBC light-heavyweight title in Montreal. The hard-hitting southpaw caught the champion with a swinging left hook with less than 90 seconds of the contest gone and, although Dawson tottered to his feet, referee Michael Griffin spared him further punishment. It was Dawson' second successive defeat - and a third career loss - after he had dropped down to super-middleweight for an unsuccessful shot at Andre Ward's title.