Diaz earned the save against the Cardinals on Tuesday, walking one and striking out one in a scoreless ninth inning.
Diaz was called upon to protect a 4-1 lead in the ninth and tallied his 24th save of the year on 18 pitches. The 27-year-old has nailed down 17 consecutive save chances and owns a 4.07 ERA, 1.38 WHIP and 41:26 K:BB across 42 innings this season.