Both fighters comfortably made weight for the 160-pound world title fight.
First there was grumbling over Alvarez's performance in the first fight held a year ago that ended in an unsatisfying draw.
Respect box? Subscribe to my podcast - In This Corner with Brian Campbell - where we take an in-depth look at the world of boxing each week.
Alvarez, who was later suspended for six months by the Nevada State Athletic Commission, insists the banned substance - Clenbuterol - entered his system via contaminated meat in his native Mexico.
A fight that had to happen after the disputed draw in the first bout nearly didn't come to be after Alvarez tested positive for clenbuterol just before beginning training for what was supposed to be a May rematch. The rematch to their highly controversial draw last September, which most thought Golovkin (38-0-1, 34 KOs) won, was eventually renegotiated and rescheduled for Saturday night.
This preview for Canelo vs. Golovkin 2 - "The REMATCH" will give you chills... "I defeated the weigh-in, and now it's time to defeat him [Saturday] night".
Alvarez is 49-1-2 with 34 knockouts in his career.
"He's promised the fans he's going to knock him out, but in order to do that you have to be in range", Sanchez said.
Despite two judges scoring the fight extremely closely - 114-114 and 113-115 in favour of Golovkin - judge Adalaide Byrd's scorecard of 118-110 in favour of Alvarez had many fans and pundits alike questioning the validity and reliability of the adjudicating.
Hurricane Florence highly unlikely to hit Cape Cod
Arnold also captured hurricanes Isaac and Helene lining up behind Florence in the Atlantic. Of the two other storms, which remain far from land, Isaac poses the most immediate risk.
First up, pound-for-pound king and former four-division world champion Roman "Chocolatito" Gonzalez makes his eagerly awaited return against experienced Mexican warrior Moises "Moi" Fuentes in a ten-round super flyweight bout.
Alvarez is scheduled to fight Gennady Golovkin in a title bout Saturday in Las Vegas.
The South Point sportsbook in Las Vegas said it was seeing good action on both fighters and bumped up its price on Golovkin to -150.
Haye went on to mention that the main reason the fight is happening is because of money.
But both fighters say they are happy with the judges for the rematch, and doubt they will come into play anyway.
"I'm going to go in there to knock him out", Alvarez said.
"I just want him (Alvarez) to do what he says he will do and try for a knockout", said Golovkin's trainer, Abel Sanchez.
"Tomorrow is a real war". "I know it's going to be a tough fight".
"I'm bothered by all the stupid things they've been saying and I've been using it as motivation in my training for this fight".