Worst beating that did not result in a KO or TKO?

[Frazier's 15th round]

Ali/Frazier in the first fight. Ali had a swollen jaw, was getting battered around the ring on two different occasions, and couldn't walk right after the fight. Frazier had huge lumps under both eyes and was in the hospital for about a week.

[LondonRingRules]

Holmes vs Tex Cobb. Holmes beat his ass from pillar to post for 15 rounds.
Cobb was a tuff SOB. It went to the score cards.

** That was definitely the most one sided beating I've ever seen. Holmes was completely wore out and thought he busted his hands. Cobb famously said if he coulda gone 20, Holmes would've dropped from sheer exhaustion from pounding on him. That was the bout that disgusted Howard Cosell so much that he retired from announcing boxing matches.

[KoolWillie]

Lewis beating Tyson