Mexican Canelo is the crowd favorite and is looking to prise the undisputed title from long-time Kazakh champ Golovkin, feared the world over for his disproportionately solid punching power, in a matchup being touted as the 'fight of the decade'.
Golovkin is the more powerful fighter, and he has faced higher-quality opposition, making him more experienced and more capable.
"I remember watching on my TV and just saying wow", Golovkin said.
Alvarez, shockingly, said that fighting the champion known as "GGG" will be a bigger showdown than his experience against Mayweather. Golovkin, 35, goes into the fight with a 37-0 record and 33 of his victories have come via knockout.
I think that Golovkin's jab will be the difference in the fight, with GGG keeping Canelo at distance long enough to squeak by in a very competitive match. He is the most risky opponent of my career, but I'm ready for him and what's next to come. "I'm prepared", added Canelo.More news: A rattled Mexico starts to pick up the pieces after deadly quake
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Billy Joe Saunders v Willie Munroe Jr is on the same night in London so I'll be interested in seeing that fight as well, with the only other middleweight belt on the line - the WBO.
Alvarez is a veteran of nine contests in Vegas - nine more than Golovkin has undertaken in the United States' fight capital.
Should the victor of the fight do so in a demonstrative and impressive way, the reward could be more than simply identification as the best middleweight in the world - in this case, the victor could find himself being declared the pound-for-pound best boxer in the world.
Ultimately, Mayweather showed the world he's an all-time great and that Alvarez still had work to do.
My next fight in November will be for the IBF European middleweight title so winning that would put me amongst the top 15 in the world rankings. Alvarez, whose only loss was at the hands of Floyd Mayweather Jr., is coming off a lopsided win over Julio Cesar Chavez Jr. last month in Las Vegas. I've worked hard for all the opportunities I've been given so I've got a real chance of getting myself into that position. I feel very comfortable.