Ah, for f*<k's sake....

De La Hoya (converted southpaw.)
Victor Ortiz
Robert Guerrero
Sharmba Mitchell
Zab Judah
DeMarcus Corley

Had to look through a list for the following early unknowns, but Mayweather, the Olympic Bronze Medal prospect, was televised on undercards.
Y'know the type of opponents, more losses than wins to help develop a young prospect.
It ain't really fight-fixing, but they know their role:

Bobby Giepert
Jesus Chavez (not the contender, different unknown guy)
Reggie Sanders