Diaz (0-1) took the extra-inning loss against the Red Sox on Wednesday, allowing an unearned run on one hit over one-third of an inning.
Diaz's first outing of his current big-league tenure, which just began Tuesday, lasted all of three pitches, as he surrendered a game-winning RBI double to Rafael Devers that plated automatic runner Tyler O'Neill. The southpaw has only one other appearance at the big-league level this season, having made a spot start against the White Sox back on June 11. While Diaz did see high-leverage work Wednesday, that's an outlier largely the byproduct of Andres Munoz and Yimi Garcia having been worked heavily over the past few days.