Most one-sided upset of all time?

[Spicoli]

Acelino Freitas vs Michael Oliveira. He had been retired for 5 years and was fighting 4 divisions above his bsst. Freitas still fucked up the punk kld Oliveria

Edwin Rosario - Livingston Bramble was one.

Rosario was not that big of an underdog.

Bramble had only lost once before and was coming off two impressive wins over Ray Mancini.
I'd say he was a clear favorite at the time.
I believe bookmakers had it 4/1 in favor of Bramble.

Thought about this one but really Rosario was still close to being Rosario. I'd go with his bulldozing of a streaking Loreto Garza yrs later and a weightclass removed. He looked like stale toast with Nazario in loss and Garza was in talks with JCC but it got delayed.

Fighting Harada coming in as a sub and ko'ing Pone Kingpetch comes to mind. Simon Browns ko over Terry Norris was great but honestly he shouldn't have been ruled as a massive underdog. Props to Terry for masterclass boxing in rematch though! Vic Toweel beating Manuel Ortiz makes the grade! J.C Rubio with 20 losses coming in and schooling pumped up HBO flavor of the month Francisco Bajado is a fav Mayorga blitzing Six heads Lewis ??