Treinen (2-1) fired two scoreless innings in a win over the Mariners on Wednesday, allowing four hits and two walks while recording three strikeouts.
The 29-year-old right-hander was making his first appearance since taking a comebacker to his shin April 24, and he corroborated his health with a 37-pitch outing. Treinen ended up as the pitcher of record following Mark Canha's ninth-inning, go-ahead home run off Mariners closer Edwin Diaz, with Wednesday's outing serving as his sixth multi-inning scoreless effort of the season.