This evolves throughout the season in the pen, we can discuss here.
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I'd say right now the circle is something like: Keller, Palencia, Thielbar, Pomeranz, Hodge (when healthy, even with inconsistency)
Outside the circle = Merryweather, Roberts, Pressly (on the bubble), Flexen (bubble)
Surprised to see Pomeranz and Flexen haven't given up a run this season yet. All the guys in the circle above (minus Hodge) have ERA's and FIP's under 3.