"I am a great fighter, and I showed it tonight", said Alvarez, roared on by a partisan crowd throughout on the eve of Mexico's Independence Day celebrations.
To his credit, he played it all perfectly, especially Saturday's 12 rounds.
The fight came after an acrimonious weigh-in during which Alvares nearly head-butted Golovkin, who is known affectionately through the boxing world as "Triple-G". It was a starkly different game plan than the one Alvarez employed one year earlier.
"If the people want a third fight, we will do it again". Oscar De La Hoya has promised that the main event will start no later than 11:00 p.m.
'Unfortunately we didn't get the knockout but thank God we walked away with the victory, ' he said.
It was about as close as could be, too.
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Despite throwing less punches overrall, Canelo landed far more power shots after completely changing tactics from their 2017 meeting.
He has an argument that he won, but the so-called boogeyman of the middleweight division fought 24 rounds against a guy moving up in weight to face him and couldn't knock him down once.
Many argued the two-weight world title holder "robbed" Golovkin of another victory.
Both fighters were cut in the course of the bout, Canelo sporting a long laceration underneath his left eyebrow, with Golovkin cut around the right eye and with swelling to his high cheekbones.
But in almost-shocking fashion, Alvarez was successful in doing something no previous Golovkin opponent had been able to do by forcing the fearsome GGG to take a step backwards during the middle rounds as Alvarez's speed and activity appeared to fatigue Golovkin both physically and mentally. This time, the fight was just about dead even and could legitimately have ended in a draw, but two of the three judges gave the edge to Alvarez, giving us a new unified world middleweight champion. On the other hand, promoter Lou DiBella felt that Golovkin was robbed a second time in a row. The fighter was clearly upset in the ring, but he and his camp were measured with their words later. "Canelo came forward and brought the fight".
"The judges saw the fight in Canelo's favor tonight".
"I'm very emotional. That's what I did".