Mexico’s Alvarez successfully defended his WBC, WBO, IBF and WBA super middleweight titles against compatriot Munguia.

Mexico’s undisputed super middleweight champion Saul “Canelo” Alvarez has retained his titles with a unanimous victory over compatriot Jaime Munguia in Las Vegas.

Alvarez, who received scores of 117-110, 116-111 and 115-112 from the three judges to seal the win, sent his opponent to the canvas in the fourth round, the first knockdown of Munguia’s career.

“Jaime Munguia is a great fighter. He’s strong, he’s smart. But I take my time. I have 12 rounds to win the fight and I did. I did really good and I feel proud about it,” Alvarez said after handing Munguia the first defeat of his professional career.

“He’s strong but I think he’s a little slow. I could see every punch… That’s why I’m the best. I’m the best fighter right now, for sure.”

Saturday’s fight, which bettered Alvarez’s record to 61-2-2, was the 33-year-old’s first since beating American Jermell Charlo last year.

It was Alvarez’s fourth time defending his WBC, WBO, IBF and WBA super middleweight titles.

Munguia, whose 34 knockouts included victories inside the distance in four of his previous five fights, came out on the attack against the vastly experienced Alvarez, pushing him back with his jab and rattling the champion in the third round with a right to the jaw.

But Alvarez responded in the fourth. After Munguia connected with a pair of solid rights Alvarez followed a left hook with a massive uppercut that sent Munguia to the canvas.

The fifth round opened to chants of “Canelo!” ringing in the T-Mobile Arena, where support was evenly divided between the Mexican combatants in a fight coinciding with Mexico’s Cinco de Mayo festivities.

An Alvarez jab popped Munguia’s head back and, in the sixth, an Alvarez left hook had Munguia’s knees buckling briefly.

In a fight billed as a possible changing of the guard, Munguia – who has honed his aggressive style under the tutelage of longtime Manny Pacquiao trainer Freddie Roach – continued to press.

But his vaunted power rarely bothered Alvarez, who repeatedly found a way past Munguia’s guard to land the more damaging blows.