Historical upsets by smaller fighters
The first the comes to mind is Michael Spinks defeating Larry Homes. He moved up from LHW to take on Homes as Homes was looking to tie Marciano's record. Spinks completely outclassed him.
More recent history, you have Penn defeating Matt Hughes. Henderson defeating Fedor. Johnson defeating AA. I suppose Kimbo Pet deserves mentions (or maybe not).
Oh and then there's the actual TUFF finale that was supposed to be just a formality for Uriah Hall.
Any others come to mind?
Just wondering if Sonnen has even the slightest potential for pulling something like this off. Normally, the bigger fighter underestimates the speed of the smaller fighter. Sonnen is actually a pretty good and underestimated boxer. He's deceptively quick with his hands. And it's possible he could out cardio Jones, not having to cut much weight. Sonnen's also a very smart fighter. Could a genius game plan be implemented?
I think most would agree if Sonnon pulls of this miracle, it would be a bigger upset than any of those above.