Stylistic nightmares: Fighters who guaranteed a bad night for anyone

No amount of money could ever get me to step into a ring with Artur Beterbiev in the opposite corner. 12 3 minute rounds are an incredibly long amount of time to spend in the ring with Artur which is a task no-one has yet accomplished. Everybody eventually succumbs to his pressure and cinder-block fists.

 

Freddie Pendleton was a guy who could make a lot of people’s night miserable

 

Gene Fullmer puts you constantly under pressure you pretty much can’t knock him out and he had real conditioning. Gene was wrestling you into fits and exhaustion, Cutting you up with jabs, elbows and crashing in with his head.
Gene didn’t stop fighting you in the clinches even if you wanted to lock down his inside fighting (which might be better then fighting there) he’d be smashing you with intent, putting a lot of shoulder into any free hand he had anywhere he could or he’d be just trying to rag doll you off him. He was a very strong man but he was also a very good boxer that had Robinson confused with his feints in there first fight when they’d box.
This is someone if I managed a 160lbs boxer I would never put him in the ring with Fullmer unless they could retire on the money - he fights every second in one way or another.

 

Don't all defensive masters with great chins pretty much fit into this category?
Many of my choices are already named so I'll mention Jersey Joe Walcott who hasn't been mentioned yet.
From when he got his style right in 1944 all the way to 1952 when he lost his title to Marciano in his second to last fight, not a single fighter had an easy time with Walcott win or lose. It's fair to say he perfectly fits the criteria.