After going unselected in the 2020 MLB draft, Pennington signed a minor league contract with the Kansas City Royals on August 24, 2020.[1] He did not appear for the organization in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[2] Pennington split his first professional season between the rookie–level Arizona Complex League Royals and Single–A Columbia Fireflies. In 25 games for the two affiliates, he accumulated a 3.32 ERA with 40 strikeouts and 4 saves across 43+1⁄3 innings pitched.[3]
Pennington split the 2022 campaign between the High–A Quad Cities River Bandits and Double–A Northwest Arkansas Naturals, compiling a 5.19 ERA with 61 strikeouts and 3 saves across 36 appearances.[4] He spent the majority of the 2023 season with the Triple–A Omaha Storm Chasers, having received a promotion following eight scoreless appearances for Northwest Arkansas. In 41 games for Omaha, Pennington logged a 7–2 record and 3.69 ERA with 64 strikeouts across 61 innings.[5]
Pennington began 2024 back in Omaha, where he posted a 2.35 ERA with 76 strikeouts across 32 outings. On July 5, 2024, Pennington was selected to the 40-man roster and promoted to the major leagues for the first time. [6]
Texas Rangers
On July 29, 2024, the Royals traded Pennington to the Texas Rangers in exchange for Michael Lorenzen, with Pennington being optioned to the Rangers’ Triple-A affiliate, the Round Rock Express, after the trade.[7]
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