The two squared off face-to-face for the first time since Alvarez scored a disputed majority decision win in 2018. The pair also fought to a split draw in 2017.
Some people believe GGG won both fights, including Hall of Fame trainer and analyst Teddy Atlas.
Since then, Canelo has gone on to unify the middleweight and super middleweight divisions while also winning a world title at light heavyweight. He did, however, get beaten by Dmitry Bivol in his most recent fight at 175lbs.
He will return to 168lbs to face Golovkin - who unified the middleweight division in his most recent bout against Ryota Murata.
The Kazakh great has fought just four times since his only defeat against Canelo with wins over Steve Rolls, Sergiy Derevyanchenko, Kamil Szeremeta and Murata on DAZN.
The duo will finally collide in a trilogy contest on Mexican Independence Weekend - September 17 - in the final installment. DAZN have the rights for America and will place it on PPV.
Speaking ahead of the fight, Canelo did not hold back when speaking about Golovkin.
"I was busy fighting with the best fighters out there. That's why [it took four years for the third fight] … Of course [he's waited around and not done anything but wait for me]. He wants his last payday.
"Look at my fights after GGG, and look at his fights," Alvarez said.
"He's not talking sh!t anymore because he has me in front of him now. Call the lion when you see he's coming - and I'm coming.
"He always pretends to be a nice guy but he's an assh-le. He's an a**hole person. He's f***ing not. It is what it is. I don't pretend to be another person. This is the way I am.
"He always says I am scared and running away when I am fighting the best guys out there and he's fighting Class D fighters. He's talking a lot of things about me - that's why it's personal."
"[It will be] so sweet [to push him off the proverbial cliff at the end of his career]. Of course [I want to retire him]. I will be [the last guy he ever fights]," Alvarez said with an ear-to-ear smile and arms folded.
"It makes me feel good," Alvarez said with a wide grin. "I don't know why he's surprised why this fight is personal for me. He knows what I think about him. I hope he's taking it personal too. He's going to need it."