Christian Mbilli steamrolled Demond Nicholson on Friday night.

The undefeated super middleweight contender knocked Nicholson down three times and stopped him in the fourth round of their main event at Lac Leamy Casino in Gatineau, Quebec, Canada. Cameroon’s Mbilli, who trains in Quebec, produced knockdowns in the first, second and fourth rounds on his way to improving to 25-0 and recording his 21st knockdown.

Referee Michael Griffin halted their scheduled 10-round bout at 1:56 of the fourth round, with Nicholson still on the canvas.

Nicholson (26-6-1, 22 KOs), of Laurel, Maryland, lost inside the distance for the third time in 10 years as a pro. Lekan Byfield and Jesse Hart previously beat Nicholson by technical knockout.

A left-right combination by Mbilli knocked Nicholson flat on his back, beneath a bottom rope, with 1:17 on the clock in the fourth round. Griffin began to count, but eventually realized Nicholson couldn’t continue.

Mbilli blasted Nicholson with a left hook when Nicholson was backed into the ropes with just under 1:15 to go in the third round.

Nicholson still seemed buzzed when the second round ended and he walked to the wrong corner.

Mbilli nailed Nicholson with another right to the side of his head, which dropped him for the second time in as many rounds with 57 seconds on the clock in the second round.

Another right by Mbilli landed to the side of Nicholson’s head and again seemed to affect him a few seconds before the opening round concluded. Mbilli landed a left hook with just over a minute remaining in the first round.

Mbilli blasted Nicholson with a right hand to the side of his head that knocked Nicholson flat on his back with 2:03 to go in the opening round. Nicholson got up by the time Griffin counted to four, but he looked like he was still hurt when the action resumed.

Keith Idec is a senior writer/columnist for BoxingScene.com. He can be reached on Twitter @Idecboxing.