The 27-year-old thwarted his opponent with a rear naked choke 38 seconds into the round, improving his record to 23-5.
Meanwhile, Craig fell to 17-7-1. He landed 13 strikes to Allen’s 52 in his second middleweight contest since moving down from light-heavyweight in July, and it showed.
After the fight, Allen spoke firmly on what his next contest would look like – ideally a shot at the middleweight title.
“I’m trying to fight, man. I want the No 1 contender. I’m the best in the world and I’m here to prove it. If you say otherwise, come show me, don’t tell me.