Don't know what the odds were, but Marquez losing to John was a hell of a shock to me (even if it was in John's backyard) here's a few more that personally shocked me: Mijares - Arce Donaire - Darchinian Campbell - Diaz Penalosa - Gonzales The biggest upsets (odds wise) have already been mentioned (Tarver-Jones, Baldomir-Judah)
Penalosa vs Gonzales was certainly an upset. Even more so when Gonzales looked to be dominating the fight until he was stopped with a body shot. Well done Penlosa.
I'm not 100% sure, but i remember Wlad being a 10:1 favorite over Brewster the first time. I actually can't imagine but odds being that far in his favor, especially since he lost to Sanders just one year before, but if those were the odds, then i think it might be an even bigger upset than Baldomir-Judah.
The odds are not always the best indicator of the degree of the upset. I predicted that Bernard would beat both Tito and Tarve. In the first case, I frankly couldn't understand why BHop wasn't the favourite. In the second case, I knew I was picking a live underdog.