An ill-tempered confrontation before several thousand fans at the T-Mobile Arena saw a minor scuffle after the two fighters came together after stepping on the scales.
The fight is a rematch from a fight in September 2017 that ended with a controversial draw.
But in March, Canelo sent shockwaves through the sporting world by confirming he had tested positive for clenbuterol - a banned substance believed to help to strip fat and build lean muscle - in two separate tests administered in February.
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A bout that was a thriller first time round.
Only a freak scorecard from judge Adalaide Byrd, who triggered uproar after ruling it 118-110 Alvarez, denied Golovkin a victory.
The official purses were confirmed to ESPN by the Nevada State Athletic Commission, although both fighters are expected to make upwards of tens of millions more after pay-per-view sales.
Alvarez blamed the test results on eating contaminated meat in his native Mexico.
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"If Canelo gives me a chance and fights like he claims he will, I will knock him out", Golovkin said. He can only talk about the doping that got him suspended for six months by Nevada boxing authorities, but he can do something in the ring to alter the perception that his style is too conservative.
Members of both entourages quickly got between the two fighters to head off a physical confrontation after Alvarez appeared to rush towards Golovkin, who didn't flinch.
Golovkin, (38-0-1, 34 knockouts), is chasing a record-breaking 21st consecutive defence of his middleweight crown when he faces Alvarez again on Saturday, September 15.
Armed with an iron chin, he will be hoping to add Canelo's name to the list of fighters he has felled inside the distance by inflicting the first knockout defeat of his rival's career.
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