Fedor. They were both slowing down, but despite the first round near-victory, Maldonado was slowing down more.
Fabio usually gets better as the fight goes on and his toughness proves too much for his opponents to overcome. He was out-toughed by Fedor, blew his wad, and had little pep left to to hit back with. Also, Fedor was being more cautious after the first, and not closing in for as long, or without diversifying his attacks as much.