fighters who destroyed the champion in their world title debut

[Juof]

what fights come to mind when the up and coming challenger challenges for his first world title and ends up destroying the champion
e.g tyson vs berbick

[Rockin']

Hearns vs Cuevas ....... Rockin'

[JAB5239]

Louis vs Braddock

[Scott9945]

Hearns vs Cuevas ....... Rockin'

That would be my first choice. Others would be Foreman-Frazier, Mayweather-Hernandez, and Trinidad-Blocker.

[Andyland]

Fighters who destroyed the champ

Johannsen-Patterson I

[Roey Haque]

Going for the obvious. Ali vs Liston.

If putting on a clinic can be described as "destroying."

[oc9979]

Trinidad vs Blocker
Mayweather vs Gatti

[bravestone]

Delahoya/Brehdal or Ruelas
Tyson over Berbick
Foreman/Frazier
Garcia/Khan

[CHEECH]

hilmer kenty v ernesto espana
mcclelland v julian jackson
aaron pryor v cervantes
uncle roger mayweather v sammy serrano
one more from the obscure challenger file, akinobu hiranaka stops edwin chapo rosario for 140 belt inside 1

[Bolo Punch]

Dempsey-Willard, anyone? The ultimate #1 answer for this question.