Iron Man 3 vs. The Avengers
Will Iron Man 3 be Bigger than the Avengers opening weekend? Iron Man 3 is off to a great overseas start at the box office but ... but ... It will have to fight on American soil with Star Trek and Fast and Furious #6.
Caveat: Iron Man 3 can't do the same numbers in the same time as The Avengers. Maybe it will win the 'take at the box office title' in time.