I have no lights-out closer.  For a whole season, I've been staring at these two guys, trying to figure out how to best utilize them.  Both are righties with good control.  One has a third pitch and the other is better vs LHP.  Ideally, I would like to get the most innings out of the best pitcher, but I'd also like to have a reliable closer.  I shared duty between the two last year, and they both let me down at points (one with a lot of losses, the other with blown saves).  Suggestions?  

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Unless you are gunning for the Fireman of the Year award, I'd make them both SuA.  Closers won't pitch as many innings, and if there's no closer to go to, your SuA will get the nod in closing situations if one is available.

Sounds like good advice.  Who makes the choice which one comes in?  The bullpen coach?

I would do what mhulshult suggested-- but whatever you did last season really wasn't that bad; they both had ERAs in the mid 3s or lower.  From checking their stats, my guess is their "clutch failures" are because your pitch count is a tad too high for both, especially Wilhelm; try taking them both down 5 pitches and see if that helps.