Their fight was crazy! I really thought that Whyte would win that after Povetkin fell down on his knees twice and had so many upper-cuts received from Whyte. But then I wasn't that shocked on the outcome of the fight as Whyte had been too confident with Povetkin seemingly weakening after his Whyte's hitting cuts and jobs against Povetkin. But if Whyte really is disappointed and would initiate a rematch, I think he only must get rid of his over-confidence in mid-fight. His punches were good and strong, noting that he wa once undefeated before their fight. Therefore, whatever his toughness level is, if he would be over-confident and would think he's already winning at his early actions, he might lose again.
I'm betting for Povetkin here. I guess he would learned what to do on their next match.