Anderson Silva didn’t even need two minutes to obliterate Tito Ortiz on Saturday night.

Silva knocked Ortiz unconscious in the first round of their boxing match between 46-year-old mixed martial arts legends. The left-handed Silva slipped several of Ortiz’s slowly delivered punches in a corner, which led to Silva turning Ortiz around and drilling him with a compact right hand and then two lefts that sent Ortiz crashing to the canvas, face first, with 40 seconds to go in the opening round of an eight-round cruiserweight fight.

Ortiz couldn’t even attempt to get up. Referee Christopher Young stopped the bout at 1:21 of the opening round on the Evander Holyfield-Vitor Belfort undercard at Seminole Hard Rock Hotel & Casino in Hollywood, Florida.

“I expected more from this fight,” Silva said. “You know, I trained hard, showed my respect for the boxing world.”

Silva, who is generally regarded as one of the best MMA fighters of all time, improved to 3-1 in professional boxing matches and produced his second knockout. Ortiz, of Huntington Beach, California, lost badly in his pro boxing debut.

Ortiz said before he was knocked out that he had to lose approximately 40 pounds in four weeks to get down to the cruiserweight limit at Friday’s weigh-in.

Brazil’s Silva has now beaten former WBC middleweight champion Julio Cesar Chavez Jr. by split decision in an eight-rounder June 19 and Ortiz in back-to-back bouts.

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