Badou Jack stopped Dervin Colina in the fourth round.

Dervin Colina came to fight.

The 33-year-old Venezuelan landed a hard right hand to Badou Jack’s face at the end of the first round of their light-heavyweight bout. Jack, who was originally scheduled to face Jean Pascal, and who has won world titles in two weight classes, barely blinked.

But Colina, a late replacement for Pascal, who was scratched from Sunday’s card after a positive drug test, couldn’t do much with a world-class operator like Jack, who stalked him from the opening bell.

Early in the fourth, Jack dropped Colina with a straight right hand to the head, and then floored him again minutes later with a right hand to the rib cage. Colina climbed back to his feet and kept fighting, even tagging Jack with a right uppercut, but the veteran pro overwhelmed him. One more right hand to the body sent Colina back to the canvas, and, because it was the third knockdown in the round, it triggered an automatic, merciful stoppage.

“I’m a way better boxer than him,” Jack said in the ring afterward. “Outbox him, and everything else will come.”

Colina, fighting in the United States for the first time, is now 15-1. Jack’s record improves to 24-3-3. He said after the fight that he plans to move up to cruiserweight, with its 200-pound limit.