Inside the Matchups: Which Ervin Santana will we see?

Swervin' Ervin

Angels starter Ervin Santana is doing his best Jekyll and Mr. Hyde impersonation, and fantasy owners aren't amused. Since returning to major league action on May 14, Santana has had three awful starts, with a total of 21 earned runs in 11 innings, and three great starts in which he allowed five earned runs in 20 1/3 innings. What's the cause for the inconsistency?