I'd go with McCallum, Nunn had allot of technical weaknesses he would capitalise on and would use his jab, timing and body attack to control Nunn
very close fight i think if mccallum is to win this he has to stop nunn , nunn could move well but mccallum would work the body obviously and nunn as with toney late on may be ahead but lose a little concentration and be to close with his hands down very close i can see either mam winning