Hartlieb has spent part of the last three seasons with the Pirates, totaling 62 innings with an unsightly 6.97 ERA. He poked 20.7% of his opponents below par against an inflated walk rate of 14.2%, although his ground ball rate of 51.4% was comfortably above par. The 6’5 ”right-hander relies primarily on a lead that sits in the 94-95 mph range and a slider that spins at around 84-85 mph.
Although Hartlieb hasn’t seen much success in the Majors so far, he has an exceptional record in the minor leagues. The former 29th round pick has a 2.82 ERA in six-season minor league games, including a 2.37 mark in 49 1/3 AAA innings. He also knocked down 31.3% of his Triple-A opponents with a much better 9.4% walk rate and a massive 64.3% knockdown rate.
Hartlieb was a rookie during his college days at Lindenwood University Division II, but he worked exclusively as a professional ball lifter. He has a minor league option beyond the 2021 season, so he gives the Mets some flexibility in the “pen beyond the current campaign as long as he sticks to the 40-man roster.”