LAS VEGAS – Anthony Dirrell delivered a performance Saturday night befitting a former champion who wants another title shot.

The two-time ex-WBC super middleweight champ viciously knocked out overmatched Marcos Hernandez in the fourth round of Showtime Pay-Per-View’s co-feature before Canelo Alvarez and Caleb Plant entered the ring for their 12-round main event at MGM Grand Garden Arena. The 37-year-old Dirrell (33-2-2, 25 KOs), of Flint, Michigan, uncorked a right uppercut that knocked Hernandez flat on his back about 12 seconds into the fourth round.

Dirrell bounced back from a 12-round draw with Kyrone Davis (16-2-1, 6 KOs) in his last fight, which took place February 27 in Los Angeles. Hernandez defeated previously unbeaten Mexican prospect Jose Armondo Resendiz (12-1, 8 KOs) in his previous appearance, a 10-rounder September 5 in Minneapolis.

Before finishing Hernandez early in the third round, Dirrell drilled Hernandez with a left hook got Hernandez’s attention in the third round. Dirrell landed the harder shots during a second round he clearly won thanks in large part to his overhand right.

Dirrell unloaded a barrage of power punches on Hernandez as soon as the bell rang to start that fight. Hernandez backed into a neutral corner and seemed surprised by Dirrell’s aggression, but he eventually adjusted and got back into the fight later in the first round.

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