The 28-year-old Alvarez, a skilled.
Alvarez is the WBA and WBC middleweight champion after a majority points decision.
Off to a slow start, both Canelo and Golovkin felt each other out as they jabbed in the opening round.
Gennady Golovkin (L) and Canelo Alvarez battle during their WBC/WBA middleweight title fight at T-Mobile Arena on September 15, 2018 in Las Vegas, Nevada.
Therefore, a score of 115-113 to Canelo is not an injustice and could be gaining more traction as "a robbery" due to the first fight result. The AP scored it 114-114.
"He's a great fighter but I'm a great fighter and I showed it tonight", Alvarez said. If Golovkin was handed the final round by just one judge, it would have ended up in a second draw between the duo.
In a rematch that outshone the much talked about split draw that the pair fought out exactly a year ago, a sell-out crowd were treated to a hand-wringingly tense and competitive affair. This time it was Golovkin who was upset, and he stormed out of the ring without talking. "I think we have to give him the credit rather than say what Gennady didn't do".
Boxing can be a fickle game in terms of how a fighter is perceived by the mainstream majority where you're only as good as your last fight.
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Alvarez is now 50-1-2 with 34 knockouts in his career, and Golovkin is 38-1-1 with 34 career knockouts. "Need one more between these great fighters". I can't complain about the decision but it's close enough to warrant a third fight.
If the people want another round, I'll do it again. "For now I'm going to enjoy it with my family". Even though he was not running this time, it doesn't mean he was controlling the fight.
"We're losing the fight!" The eighth round saw Canelo bleeding above the cut as Golovkin began to close the gap.
But Triple G came on strong in the final few rounds to make it as close as it could be. Many observers believed there was no room for argument for the bout going either way, but, in the end, the judges favored the youthful aggression of Canelo to the calculated experience of the masterful, but now defeated Golovkin.
The win wiped away months of simmering acrimony which stemmed from Alvarez's failed drugs test in February, forcing the cancellation of a rematch scheduled in May.
And the tactic paid off as Canelo dethroned Golovkin on Mexican Independence Day.
With Golovkin needing a big finish in the 12th, Alvarez again proved up to the challenge, shrugging off an early uppercut to hold on for the win.
"I showed my victory with facts, " Alvarez said. He was the one who was backing up. "It was a clear victory". Great fight with two great champions!
Many argued the two-weight world title holder "robbed" Golovkin of another victory.