James Toney and Roy Jones

Those two will go to the grave hating each other, or at least Toney. To this day when he does an interview and they bring up Roy he get's pissed off but then again he alway's get's pissed off

Tarver-Jones
Corrales-Mayweather
Vargas-De La Hoya
Mayorga-Everybody

have all had great grudges in and out the ring.