In your opinion, what's been GGG's career best performance?

You need a credible opponent first.

 

Lemieux

he proved a lot of people wrong, who claimed he has no defense, is a come-forward one dimensional slugger with no footwork who relies solely on his power

 

Lemiuex - boxing
Brook - fighting

 

silencing a post prime but still world class Geale

 

His best performance was asking Canelo's belt then Canelo obliged like the good boy he is.

 

Shakespeares Hamlet 2.

 

Against your countryman Lemieux.

 

when Danny the fannie got koed you can truly say that 3g was world class for the first time.

Although its obvious he had reached that level earlier, in retrospect. That would be the proof year though.

 

Because styles makes fights. For example a great counter puncher may look in his element against an aggressive face forward fighter. But against a slick boxer looks off.

Golovkin is a well schooled fighter. Adept at boxing, slugging and swarming.

 

GGG fought that way because he knew Brook didn't have the power or strength to compete with him. There's weight classes in boxing for a reason.

 

vs Lemmy

control with the jab and total dominance.

 

Lemieuex is his most brilliant performance.
Brook was his toughest battle, at his weakest moment.