Mexico is favorite way over Costa Rica, but odds can be "tricky" sometimes, I'd put my balance on the "tie" eventhough I think mexico is going to end up winning the game.
Everybody'd take Mexico over Costa Rica, but you need to take in consideration that CR has a very good team, on the other hand Mexico is Mexico, I'd bet on the "tie".....and then after 90min of play we'll see what happend.