Golovkin, 37 fights unbeaten with 33 knockouts, has never even been knocked down in his professional career and will defend his WBA, WBC and IBF middleweight titles on Saturday night.
Alvarez is a former world champion in his own right, having previously held belts at middleweight and light-middleweight, and his slick counter-punching is expected to test Golovkin to his very limit.
But first, both must get under the 170lb middleweight limit at the weigh-in – so here’s how to make sure you don’t miss it.
Canelo vs GGG weigh-in: When is it?
The pair are due on stage at 12.30pm local time in Las Vegas – which will be 8.30pm on Friday night in the UK.
That means they will weigh in some 32 hours before they are expected to take to the ring on Saturday night. The main event is scheduled to get underway at 8pm in Las Vegas, which is 4am on Sunday morning in the UK.
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Canelo vs GGG weigh-in: How can I live stream it online?
BoxNation have won the UK rights to show the fight. They will also show the weigh-in but it will be available as a freeview event on their satellite channel, Sky 437, from 8.30pm UK time.
The action will also be available to stream live on Youtube as BoxNation try to give as many people as possible the chance to see the two fighters ahead of their epic showdown on Saturday.