Canelo beating Golovkin in the rematch was very satisfying Marquez beating Pacquiao by KO was even more satisfying
Not by our expectations, but he was a betting underdog. Probably a boxing industry-wide (peers, pundits, fans) underdog, too. Off the top of my head, nominations to; Gomez-Arthur, Morales-Pacquiao I, Pavlik-Miranda, Pavlik-Taylor I, Margarito-Cotto I, Salido-López I, Mitchell-Murray, Froch-Bute, Malignaggi-Senchenko, Fury-Klitschko, Fury-Wilder II. There'll be tons I'm forgetting at the moment.
Calzaghe-Lacy, of course. Less widely heralded, William Warburton-Georgie Kean. More recently, Leach-Bourke.