At the present time, I have no clue what to expect from Kenly Jansen in 2021. 2019 was Kenly Jansen’s worst season on record, as he put up a 3.71 ERA and a 1.063 WHIP, after having four straight years with a WHIP under 1.00. At the start of the Pre-COVID-19 Spring Training, Dave Roberts discussed what to expect out of Kenley Jansen, his injury in 2019 and his working with Driveline Baseball:
Jansen had his delivery analyzed and adjusted by a data-driven assessment from Driveline Baseball, changed his winter throwing program and reported to Spring Training in great shape, ready to bounce back.