Saul Alvarez finishes Caleb Plant in historic fight to become boxing's undisputed super middleweight champion

• Boxing's No.1 fighter has done it again.
• Saul 'Canelo' Alvarez won another world championship belt with a knockout performance Saturday.

Saul 'Canelo' Alvarez finished Caleb Plant in a historic fight Saturday to become boxing's undisputed super middleweight champion at the MGM Grand Garden Arena in Las Vegas.

It puts a punctuation mark on an extraordinary run at 168-pounds for the sport's No.1 boxer, as he won his first two titles in the division 11 months ago, before adding another just five months later.

Having beaten Callum Smith, Avni Yildirim, Billy Joe Saunders, and now Plant, Alvarez wraps all four of the major championship belts around his body.

He's cleared out the entire division, but what's more - he's done it in style, as he's made defeating title holders look easy when, it practise, it is anything but for most fighters.

Alvarez, though, is not like most fighters. This is a boxer who is different. His activity alone is a throwback as he competes frequently, and he appears in the midst of a quest to secure an extraordinary legacy.

He's already established himself as the pound-for-pound king in the post-Floyd Mayweather era. And he's arguably the greatest boxer Mexico has ever produced.

Yet, at 31, he is young enough to achieve even more as combat sports history continues to write itself before our eyes.

Body-punching key for 'Canelo'

Plant began the fight well, out-landing Alvarez in rounds one to three - dictating the ebb and flow with his lead jab.

Alvarez's strategy was a long-term one as his meticulous body-punching took hold as he amped his attack in the mid to late stages of the bout.

In total, of the 117 punches Alvarez landed in the entire fight, 53 were thrown to the body (and 52 of those 53 were all power shots), according to Compubox data sent to Insider.

Alvarez increased his output as Plant appeared to fade and like the stories from many of Canelo's recent wins, the finish seemed a foregone conclusion.

Plant was tough but Alvarez is tougher, and he put him down twice in the 11th round, making the American try to balance on wobbly legs, as he battered him around the ring.

Watch Canelo close the show right there:

"Caleb is a good fighter," said Canelo after his win. "I have a lot of respect for Caleb Plant. He was a difficult opponent with a lot of ability and I do respect him.

"We are both men at the end of the day. He wanted to fight me and still continue. I told him there's no shame. We had a great fight tonight."

Victory advanced Alvarez's pro boxing record 57 wins (39 knockouts) against one loss and two draws.

It is unclear who Alvarez will fight next, or when he will return, but if he does return to fight on Showtime pay-per-view like he did Saturday, then big-name opponents like Jermall Charlo or David Benavidez could be next.