I watched a little bit of Perez against the Phillies last Sunday. While he only gave up the one run, he was dangerously close to giving up a hell of a lot more. In 5.1 inn8ngs, he gave up 8 hits and 3 BBS. Made some good pitches when needed and was bailed out twice with a DP. If I recall, the ump was pretty generous with the corners.
I guess good pitchers are the ones that get out of jams with minimal damage, if any.