Treinen struck out two and walked one in a scoreless ninth inning against the Royals on Wednesday.
It wasn't exactly a high-leverage situation, as the Nats were up 13-2 at the time, but the outing still dropped Treinen's ERA to 3.27. He also has five holds to go along with a 1.27 WHIP and 12:6 K:BB in 11 innings, but Dusty Baker seems to be using him more as a short-relief jack-of-all-trades than a consistent setup man, so Treinen may not be able to keep up that pace in holds even if he continues pitching well.