Berto way too fast for the blood and guts warrior. His uppercut would find it's mark early in the fight, most likely dropping Gatti, but where it would be interesting would be in the middle rounds if Gatti got that far. Berto usually slows down as most fast starters do and his output drops, shortening the distance. Gatti outgunned, but not outwilled would have most success in the trenches, possibly even flooring Berto. I'd still favor Berto as Gatti had problems mostly with speedy fighters.