The odds might be rising because Messi might not be in the starting line.
If not that will suck for over on goals bets or for a half time win.
Is he injured? What's the reason he didn't start in final game? It's too rare he miss games for injuries but he missed a couple at the start of previous season. If he plays Argentina is the favorite, but I don't underestimate Chile and Alexis Sanchez. They are the last champion for a reason.
No. That is usually the reason why they rise all the sudden when something like that comes to known before a match starts.
But they are back to 1.83 so I am guessing those assumptions of an absence have been quelled.