Real Old Stuff
The one and only Gorgeous George. It's often said that he was the first professional wrestler in history to portray a "character". He even brought his own air.
Killer Kowalski
The Fabulous Kangaroos take it to Antonino Rocca and his partner. The Fabulous Kangaroos were truly hated, and often inspired riots at the arenas.
Antonino Rocca with his version of a the human torture rack on one of the Valiant Brothers.
The original Nature Boy, Buddy Rogers, versus Pat O'Conner.