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What does it take to make someone the best boxer of a generation?

Is it a determination to entertain? Destroying all before you in spectacular fashion. Perhaps a sheer ruthlessness? Boasting an unbeaten career and knocking out opponents left, right and centre. Or is it your legacy? Achieving that one moment of greatness and doing the unthinkable, the impossible that is forever remembered.

The three often are as one when a boxing great rises to the fore, someone like, say, Gennady Golovkin - the unbeaten Kazakh who has won 32 of his 35 pro fights by knockout.

Beating such a man, and jumping two weights to do so, must make you one of the best ever, then? Kell Brook certainly thinks so...

Sheffield's finest will get his chance after 22:00 BST tonight.