gotta give credit for Peterson for fighting everybody
Bradley
Victor Ortiz when he was a thing
Khan
Matthysse
Swift
Diaz
and now Spence
idek who else in the boxing world have such a good list of opponents, Ward had and he even beat all of them but he retired, I can't think of anybody else aside of veterans like Pac, Cotto or RJJ
maybe Canelo with having Floyd, Trout, Lara and GGG on his resume
Swift with Matthysse, Khan, Peterson and Thurman comes close too
Trout with Lara, Canelo, Charlo and Cotto - and now Hurd- is up there too
oh and of course Salido with JMM, Guerrero, Juanma, Gamboa, Mikey, Loma, Rocky, Vargas, Berchelt...
yeah I think Salido is the winner
Darnell Boone maybe, Ward, Lara, Pascal, Stevenson, Kovalev, also solid guys like Monroe, Periban, Vera, Edwin Rodriguez or Stevens but he took on those fighters while they were up and comer prospects so he did it a few levels below Peterson or Salido.
all these mother fukkers are now if you aren't cutting crazy weight now a days you ain't got a chance 
