The other thread on underdogs got me thinking about this.
Off the top of my head...
Froch - Bute
Calzaghe - Lacy
Haye - Enzo (a bit of a reach this one maybe - was Haye favourite?)
Khan - Alexander
It's hard to think of many. Pacquiao - ODLH could be on there for the beatdown element, but it wasn't a 50-50 fight. Oscar was a big favourite.