Mayweather may well be a punk/thug, but he is damn good. The one thing these 2 have in common is never beating a great fighter in their prime.
'Boro vol brought up the Judah fight...Zab fought aggressively for the first 3 1/2-4 rounds, but ran out of gas via Floyd's fast feet and counters...4 rounds does not qualify as "large portion of the fight".
That said, The only fighter who had a good chance of defeating Floyd was J.L. Castillo, an Iron Chinned brawler with a suicidally aggressive mentality. I think this is the way to beat a great ring general like Mayweather, case in point, Ricky Hatton TKO'ing Kostya Tszyu, neglecting technical boxing, rushing in, eating one on the grill to throw several power punches to the body.
Oscar has never won a fight like this as the 'brawler', and i have no reason to believe he will now. Maybe, though, Maybe, Oscar will use his size and reach to an advantage, and rush Floyd towards the end of the rounds, absorbing the impending head shots to land good power shots to the body, in order to slow Mayweather's feet.
This won't happen however, as despite the pomp and circumstance, De La Hoya will be outclassed from the opening bell.
Despite Golden Boys' reputation of promoting fixed fights (see the Barrera/Marquez card) I'm still rooting for Oscar to beat Floyd, but I'm going to say it will be a stoppage in the 10th or 11th, with Mayweather the victor....than we can finally have Mayweather/Margarito