By Jim Dower: Middleweight contender Sebastien Demers (27-2, 10 KOs) stopped Martin Berthiaume (14-4-2, 8 KOs) in the 5th round on Saturday night at the Montreal Casino, in Montreal, Quebec, Canada. Demers, 29, making his 2nd fight since suffering a disappointing 10-round decision loss to Dionisio Miranda in August 2008, had little problems with the experienced Berthiaume, hammering him with uppercuts and hooks in every round until Berthiaume quit on his stool following the 5th round.