Treinen (1-0) worked a scoreless ninth inning Monday, walking one and striking out one, to pick up the victory in an extra-inning win over the Braves.
The Nationals' presumed setup men, Shawn Kelley and Felipe Rivero, both struggled Monday, with Kelley looking especially bad. It's too early to anticipate a shake-up in the bullpen pecking order, but if Treinen continues to be effective he could work his way into more high-leverage situations.