Jennings only pitched 4.2 innings in the big leagues in 2019, after serving stints in the minors with the Yankees and then Nationals. His primary pitch is the sinker which he threw 53.9% of the time over 64.1 innings with the Brewers in 2018. He gets 14% more vertical movement than the average slider but 24% less horizontal break and sits around 91 mph. Not a swing-and-miss pitch (with a 6.1% SwStr in 2018),d Jennings used it to force a 65.1% groundball rate.
Averaging 91.2 mph, Jennings fastball is mostly of the sinking variety and had a whopping .545 batting average against it in 2019. The pitch finished with a 20% K-rate and an unwieldy 26.7% BB-rate.
In typical sinker fashion, Jennings generated plenty of ground balls with it and even saw a small uptick in swinging-strike rate, thanks to throwing it in the zone less.
Jennings used the slider as his strikeout pitch. He tried to get batters to chase out of the zone with his 32.5% zone percentage and saw his swinging-strike percentage on the pitch go up.
Over the last two years, Jennings has prefered his two-seamer to his four-seamer, but his four-seamer still produced a 66.7% ground-ball rate and a 0.0 HR/FB%, showing it has its usefulness.