John Krasinski has read for the part of Captain America four times, and is doing screen tests, an inside source at Marvel tells Fox News. The source adds: "He has screen tested 2 times so far. It's very likely that he will be the new Captain America. He is a favorite among the key decision makers and has been asked to come back for more this week." And these decision-makers are having Krasinski test opposite various actresses, so they can lock in the other key roles once the lead is cast. Adds the source, a comics fan who works at Marvel: "It's a surprise and we are bracing ourselves for 'that guy from 'The Office'' to land Captain America. They are not really looking at the other guys, so it's time to get ready to work with him." [Fox411]