Key questions for Crawford-Porter: Porter's aggression the difference? Is Crawford done with Top Rank?

There's plenty at stake on Saturday night in the welterweight title fight between Terence Crawford and Shawn Porter.

source https://www.espn.com/boxing/story/_/id/32631316/five-questions-terence-crawford-shawn-porter-crawford-future-how-close-crawford-errol-spence-jr