McCallum vs Toney 1 and 2 were exhibitions of infighting at the highest level imaginable. Toney vs Jirov had some pretty nice action on the inside.
Julio Cesar Chavez vs Rocky Lockridge. Chavez showed some boxing skill in this one but there were certainly some good in fighting sequences.
Lockridge was a very strong in-fighter; can't blame Chavez for electing to box him.His fights with Pedroza(who was always far more interesting to watch when he was operating at close range) featured some long,interesting inside fighting,and I thought he got shafted in both fights(the first one especially).
Toney/Jirov was too damn one-sided in Toney's favor and Chavez fought too much off the back foot against Lockridge to call that an "infight"(can't blame him. Rocky was strong as a bull).
great answers so far. i'm gonna throw in halger/mugabi in this. for extended periods, it was trench warfare and marvin got his fair share of bumps in there