This was a hard one. Tom Hardy had the biggest breakout with Dark Knight Rises; but conversely, his fantastic performance in Lawless has (so far) been contained to a smaller crowd. Andrew Garfield continues a meteoric rise with Amazing Spider-Man, but that was his only big run this summer. Jeremy Renner, meanwhile, became a major face in not one, but two major blockbuster franchises - Marvel's The Avengers and The Bourne Legacy - meaning he got the most exposure of the three.
Sure, Bourne Legacy has been something of a box office disappointment ($160 million worldwide on a $125 million budget); however, that misstep won't be enough to derail the entire franchise (especially if Matt Damon returns as Bourne), and Renner's character is still part of the equation. Factor in his attachement to the Mission: Impossible franchise and Oscar nomination for The Hurt Locker in 2010, and it's a good time to be Jeremy.