Chavez will have had to cut weight, then gain weight, while Alvarez has stayed steady throughout.
Many fight fans were worrying they may never see two of the best pound-for-pound fighters on the planet face off, but Canelo confirmed the super-fight after cruising through his all-Mexican clash with Julio Cesar Chavez Jr.
But the Kazakh KO artist did not sign the contract after being put under pressure by Alvarez's team to wait until September after a tough defence against Daniel Jacobs in March. Only the venue is undetermined.
"He's a good fighter, but I've been taking care of my conditioning and training", Chavez said. With the victory, Alvarez moves to 49-1-1 during his boxing career. His left eye swelled in the sixth and started to close a round later.
Alvarez entered the fight as the No. 1-ranked junior middleweight and the No. 7-ranked pound-for-pound fighter, according to ESPN. "I showed as a fighter I could do all things".
'The opponent is going to give me the tools to showcase myself and that's what is going to happen'.
Golovkin strode toward the ring, the same one he'd appeared in a year earlier after being jilted by Alvarez. GGG has never fought in Vegas, and in fact all but one of his US-based matchups have occurred in either California or NY.
In response, Golovkin said: "Congratulations".
"Right now I'm very happy and for us, Canelo and me, I'm very excited", he told ESPN.
31-year-old Chavez Jr was equally vocal about the duos long-standing ill will, believing that this fight is the most important of his 14-year career and one he can win by knockout. But he proved no match. All three scorecards came in at 120-108 for the 164.5 lb Catchweight affair, with Boxing Base tallying the action at 119-109.
"He beat me with his distance and speed", Chavez said. "I would've attacked more, but I would've been countered by his punches".
Against Chavez, Alvarez's work rate never dipped as he landed clean shots from start to finish with his right hand - thrown at blistering speed - one of his most unsafe weapons.
"It wasn't working. He did a good fight he was very smart in there, very intelligent what he was doing".