The 32-year-old Jennings only threw 1 1/3 innings with the Yankees’ Triple-A affiliate in Scranton, but his production was disastrous in that small sample. He yielded five earned runs on five hits, including three homers. Jennings was better with the Nationals earlier this season, though that isn’t saying much. He surrendered eight runs (seven earned) on eight hits and seven walks (nine strikeouts) across 4 2/3 frames in Washington, making him one of many relievers to struggle as members of the Nats this season.
Of course, it hasn’t always been so difficult for Jennings, who had been an eminently effective option with the Marlins, White Sox, Rays and Brewers from 2012-18. During that 343 2/3-inning span, Jennings recorded a stingy 2.96 ERA/3.83 FIP with 7.12 K/9, 3.93 BB/9 and a terrific 55.3 percent groundball rate. He’s only a year removed from posting a useful 64 1/3 frames in Milwaukee, where he managed a 3.22 ERA/4.09 FIP with 6.3 K/9 and 3.22 BB/9, and induced grounders at a 56.1 percent grounder clip. As has typically been the case, lefties had a tough time figuring out Jennings, who limited them to a measly .251 weighted on-base average as a Brewer. For whatever reason, though, Jennings hasn’t come close to replicating his past success this season.