what a brawl canzoneri would get drawn into a slugfest by mancini ,although canzoneri was once tittle fighting as a feather he fought world class fighters up to welterweight and had ko wins so could match mancini for power i think mancini would mark up quicker and that could be all the edge canzineri would need so my guess would be canzoneri by late round tko with mancini not being able to aviod punches with only one eye and ref saving him arond the 14th. just my opinion.
Canzoneri was a much better inside technician. I see him ducking and dodging away from Mancini's attacks and firing back with precise counter right hands. Great action fight, but eventually Canzoneri busts him up and either wins a clear decision or stops him late.