Hollowell spent the 2021 season split between the rookie-level Arizona Complex League Rockies and Single-A Fresno Grizzlies. In 24 combined appearances,he posted a 3-0 record and 2.25 ERA with 33 strikeouts and 5 saves in 24.0 innings pitched.[4] Hollowell began the 2022 season with the Double-A Hartford Yard Goats,pitching to a 4-2 record and 3.14 ERA with 64 strikeouts and 16 saves in 42 appearances.
On September 18,2022,Hollowell was promoted to the major leagues for the first time.[5] He made 6 appearances for Colorado in his rookie campaign,posting an 0-2 record and 7.71 ERA with 8 strikeouts in 7.0 innings pitched.
Hollowell was optioned to the Triple-A Albuquerque Isotopes to begin the 2023 season.[6] In 26 games for the Rockies,he logged a 5.88 ERA with 32 strikeouts across 33+2⁄3 innings pitched. Hollowell was again optioned to Triple–A Albuquerque to begin the 2024 season.[7] In six appearances, he struggled to a 16.62 ERA with six strikeouts across 4+1⁄3 innings.
Arizona Diamondbacks
On June 18, 2024, Hollowell was claimed off waivers by the Arizona Diamondbacks.[8] In 18 games for the Triple–A Reno Aces, he logged a 3.63 ERA with 24 strikeouts over 17+1⁄3 innings pitched. Hollowell was designated for assignment by the Diamondbacks on August 20.[9]
Chicago Cubs
On August 23, 2024, Hollowell was claimed off waivers by the Chicago Cubs.[10] He made one scoreless appearance for Chicago, striking out one batter across 1+1⁄3 innings pitched.
Hollowell was optioned to the Triple-A Iowa Cubs to begin the 2025 season.[11]
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