Here's the wins:
April 23: Entered in the top of the seventh with bases loaded and one out, ahead 2. Sac fly scores 1. Allows triple and sac fly in the eighth to tie the score. Nats score in bottom of the eighth.
April 25: Entered in top of the ninth, down 1. Goes 1-2-3 and Nats score twice in the bottom of the ninth.
April 29: Entered in top of ninth, two outs, runners on second and third, down one. Gets the out. Nats score twice in bottom of the ninth.
May 4: Enters in bottom of the sixth, tied. Gets all six batters in two innings, Nats score three in top of the seventh.
May 6: Enters in top of the seventh, ahead 1, one out and runners on first and second. Single, single, groundout, single with runner thrown out at home. Nats now down 8-6, but score four in the bottom of the seventh to go up two. He does go 1-2-3 in the top of the eighth.
So the 1st and 5th were when he blew the lead and then vultured a win. In the other three, he did his job and vultured.
Looks like it's been feast or famine. In the "bad outings can ruin a reliever's ERA" department, he's given up 10 of his 14 earned runs in three games, including Wednesday, when he got the dreaded "Pitched to three batters in sixth" line in the box score.
In his other 14 appearances, he's thrown 15.1 innings, with 9 hits, 3 walks (0.786 WHIP) and 4 earned runs. (2.35 ERA).