Spends looks very skinny in his most recent video after cutting all that weight, and from the fight with Brook we can see he gets hit in the face a lot. That makes me think he'll get knocked out.
Same thing that happened with mayweather and augustus. If augustus had any power behind his punches mayweather would have gotten knocked out in the 5th round.
I don't know about boxing, i'm just spectating. But to me it seems like a skinny guy, who gets hit in the head and on the chin a lot, will lose to a bigger guy, who throws power shots. The fight is 12 rounds, and all Porter had to do is catch him in one of those rounds and lay him out, and it seems like Spence gets caught a lot. Spence does not seem very fast either, like Mayweather was with Augustus or with a power puncher like Canelo. He leaves his jabs out for a long time and leaves his chin exposed and he does not have good hand speed like Khan. Floyd beat Canelo because he was fast enough to dodge punches and stayed in his shell. Spence doesn't have a shell and doesn't doge punches
I'm going to put $100 on Porter and see what happens.