Diaz hit two batters but struck out the side against the Indians on Thursday to earn his first save of the season.
He also committed a balk and allowed two stolen bases, but in the end, Diaz shut the door, as he did 34 times in 39 chances last season. The 24-year-old has really good stuff and will continue to get the ball in the ninth, but the Mariners are under a lot of pressure to win now and Diaz probably can't afford many hiccups this year.