froch-groves
degale-groves
eubank-benn(eubank always maintained he didnt 'hate' benn and that it was just business but the hate on both sides was real)
saunders-eubank jnr
barerra-morales
Emmile Griffith vs Benny Paret
Morales vs Barrera although they are cordial now, they had serious beef.
Cotto vs. Margarito, Cotto hates his guts didnt even want to shake his hands during the rematch press tour.
Vargas vs Oscar, Vargas hated Oscar guts
I think Paret vs Griffth takes the cake, I don't know of any other fighter that actually succeded in killing their rival.
Duran vs Leonard 1, Duran hated everything that Leonard stood for, insulted his manhood consistently, and Leonard hated him in kind. Watch when Leonard tries to bump gloves after the fight is over, Duran isn't having any of it.
More recently Martinez vs Chavez.
Emmile Griffith vs Benny Paret
Morales vs Barrera although they are cordial now, they had serious beef.
Cotto vs. Margarito, Cotto hates his guts didnt even want to shake his hands during the rematch press tour.
Vargas vs Oscar, Vargas hated Oscar guts
Morales Barrera
Froch groves
Dammit you beat me to it....those morales-Barrera encounters during their trilogy was epic....they couldn't have a face off without swinging @ each other
Vargas vs dlh
Toney vs Jones
Hearns vs hagler
Cotton vs margarito 2
Morales Barrera
Froch groves
I'm surprised this fight didn't win any KO of the year given the circumstances of the rematch.
ESPN gave it to Klitschko>Pulev
The Ring gave it to Lee>Jackson