Treinen recorded a five-out save, allowing only one hit and striking out two, in a 4-2 victory over the Angels on Saturday.
The Athletics nearly wasted six scoreless innings from starter Brett Anderson, but Treinen came on with a runner on first to shut the door. After posting two outs in the eighth, Treinen retired the Angels in order in the ninth. Last season, Treinen was fantastic, registering a 0.78 ERA, 0.83 WHIP and 100 strikeouts in 80.1 frames. He's allowed one baserunner and struck out six in 4.2 innings to begin 2019.