BoxRec

15 rounds, who wins?

McCallum on points in a competitive bout.

Both are great great fighters .I think Napoles was best from lightweight-welterweight.
At this range he was near unbeatable.When going up his skills were hampered.
I assume the fight takes place at 154-160 which played into the bigger McCallum who was a great fighter who successfully fought up to cruiserweight.
McCallum too big and takes a 15 rd decision

At 154lbs, nobody beats The Body Snatcher, unless you are the great Sugar Ray Robinson.

McCallum by UD or late stoppage.

McCallum KO9

Napoles by decision, despite the weight difference.

Napoles on pts at 154.