Diaz picked up the save Thursday, fanning two in a perfect ninth inning.
The Mariners' poor offensive showing in the first few games left Diaz largely out of work, but after a ninth-inning rally put Seattle ahead heading into the bottom half of the inning, it was finally the 23-year-old's time to close the game out. He looked sharp in the outing, firing 12 of his 17 offerings for strikes and not giving Houston a sniff of hope for a comeback. Diaz appears to be picking up right where he left off last season, and should continue to be a staple in the Mariners' ninth this season.