It happened so quickly that almost no one was quite sure what they had witnessed in real time.
Andrei Arlovski retained the undisputed Ultimate Fighting Championship heavyweight title when he punched out Paul Buentello in the first round of their UFC 55 main event on Oct. 7, 2005 at the Mohegan Sun Arena in Uncasville, Connecticut. Buentello clocked out a mere 15 seconds into Round 1, suffering his first defeat in more than two years.
Just 26 years old at the time, Arlovski had been promoted from interim to full-time champion two months earlier after Frank Mir suffered career-threatening leg injuries in a motorcycle accident.