Everyone expects Hulk to fuck up Thor but it looked like Hulk was gonna get a pretty solid uppercut.
Kind of makes sense really; once Thor gets an idea of how strong Hulk really is, like he did in their first fight.
He would know that he would have to rely on his skill more, especially if he's going into it weakened.
And Hulk of the movies hasn't really shown the same level of skill that would let him compete with the big buys like the comic has.
So it's reasonable that Thor could have a pretty dominant fight until the last moment where Hulk gets po'd.