There is no doubt in my mind that Mayweather has manufactured a brilliant career over the years carefully picking opponents and avoiding those he knows would trouble him.
Only Jose Luis Castillo has given him trouble and that was only because he totally underestimated him the first time. Mayweather has avoided splendidly Mosely, Tszyu, Cotto, Hatton and Margarito in favour of fighting washed up older guys like Mitchell, Gatti, DeCorley a journeyman in Baldomir and a mentally challenged Zab Judah whose career is in the doghouse! Mayweather will need every bit of those great defensive skills he has to avoid a humiliating defeat at the hands of De La Hoya.
Then he should go back to 147 and prove he really is as good as he says he is and unify the Welterweight crown. Stop talking about it Floyd and do it!! Currently you would be ranked about 20th in any list of the best fighters of the past 30years.