Diaz pitched a scoreless ninth inning, working around two hits to earn the save in a win over the Cardinals on Thursday.
Diaz was pitching for the first time since exiting Sunday's game with back tightness. He allowed the tying run to come up to the plate before retiring the final two batters. It was a nice bounce-back performance after surrendering three earned runs in his last outing. The 27-year-old is a perfect 4-for-4 in save chances and has allowed earned runs in only two of his 12 appearances.