One of the most dominant relievers of all-time, the 29-year-old flamethower hasn’t been himself this season, as his pedestrian ERA (4.29), plummeting strikeout percentage and falling swinging-strike rate indicate. Chapman’s also amid arguably the worst stretch of his illustrious career, one in which he has yielded two earned runs in three straight appearances for the first time, and made a couple mental errors in the Yankees’ loss to the Red Sox on Friday. Chapman was responsible for a double steal when he neglected to keep tabs on the Red Sox’s runners on first and second base, and he then failed to back up home plate on a two-run single by Jackie Bradley Jr. Those slip-ups led to an animated mound visit from Girardi,