"Which active American boxer is the biggest star?"
There are good young American fighters like Crawford, Spence and Porter, but we don't have a star. I'd argue that Broner and Garcia are the biggest names of active US fighters right now.
12. "who's the bigger draw in Spence-Algieri? Honest question" In response to Reply # 11
I'm legitimately very excited for this fight and I've been on the Spence bandwagon since when nobody knew he existed, so it's kinda in my interest to prop up Algieri as a star.
I think he would be the A side in negotiations against anybody from 140 to 154. He has been on the undercard of one of the biggest pay per view attractions in recent years (Mayweather/Alvarez) and has remained undefeated. He is also an Al Haymon fighter.
Cotto could be 2nd if we are talking about appeal.
Crawford is the next big thing. He just needs a dance partner to get to that next level. Although I think Ward is the best fighter in the sport, his style doesn't necessarily lend itself to casual fight fans paying to see him fight.