Diaz struck out the heart of the Orioles' order Friday to preserve a 3-2 lead, giving him 26 strikeouts in 14.1 innings since his callup.
The potential tying run reached on a single after a leadoff strikeout of Adam Jones, but Diaz came back to strike out Manny Machado and Chris Davis. He got ahead with an upper-90s fastball and then rang up each on an 88-mph slider. Diaz has impressed in his short time with the Mariners. He'll likely continue to be leaned on in high-leverage situations.