The Miami Marlins selected Krook in the competitive balance round,with the 35th overall pick,of the 2013 Major League Baseball draft.[3] Although he had originally intended to sign with the team,and the two sides had agreed upon a contract,he failed a physical examination due to an unspecified issue with his left shoulder. The Marlins withdrew their offer and Krook declined to accept a reduced signing bonus.[4]
College career
Krook enrolled at the University of Oregon to play college baseball with the Oregon Ducks. He was named a Louisville Slugger First-Team Freshman All-American. He pitched to a 2–1 record and a 1.79 ERA,with 60 strikeouts. Among his highlights that year were an 11-strikeout performance against Loyola Marymount[5] and a quality start where he allowed only five hits in seven innings against Hawaii.[6] Krook's season ended unexpectedly after he felt arm stiffness in a game against Washington State. He elected to undergo Tommy John surgery on April 22,with the procedure done by noted orthopedic surgeon Dr. James Andrews.[7]
Krook did not pitch his sophomore season,although he had expressed interest in playing in the 2015 NCAA tournament and would have agreed to burn his redshirt had the Ducks made it past the Springfield (IL) Regional.[8] In 2015 he played collegiate summer baseball for the Wareham Gatemen of the Cape Cod League where he pitched to an 0–1 record with a 6.35 ERA and 15 strikeouts in six starts.[9]
Professional career
San Francisco Giants
The San Francisco Giants selected Krook in the fourth round,with the 125th overall selection,of the 2016 Major League Baseball draft.[10] Krook signed with the Giants,was assigned to the rookie-level Arizona League Giants,and was later promoted to the Low-A Salem-Keizer Volcanoes. He posted a combined 1–4 record with a 5.53 ERA in 13 games (11 starts) between both teams. He spent 2017 with the High-A San Jose Giants where he went 4–9 with a 5.12 ERA in 25 games (17 starts).[11]
Tampa Bay Rays
On December 20,2017,the Giants traded Krook,Christian Arroyo,Denard Span,and Stephen Woods Jr. to the Tampa Bay Rays in exchange for Evan Longoria and cash considerations.[12] Krook spent the 2018 season with the Double-A Montgomery Biscuits,pitching to a 4–2 record with a 4.26 ERA in 37 games (six starts). He returned to Montgomery to begin 2019.[13] In 32 appearances (18 starts) for the Biscuits,Krook registered a 2–3 record and 4.50 ERA with 52 strikeouts in 50 innings pitched. He did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[14]
New York Yankees
On December 10,2020,the New York Yankees selected Krook from the Rays in the minor league phase of the Rule 5 draft.[15] He began the 2021 season with the Double-A Somerset Patriots[16] and was promoted to the Triple-A Scranton/Wilkes-Barre RailRiders during the season. He started for Scranton/Wilkes-Barre on Opening Day of the 2022 season.[17] Krook had a 10–7 record and a 4.09 ERA for the RailRiders in 2022. His 155 strikeouts set a new franchise record for a season which was previously held by Carlton Loewer since 1997.[18]
On November 10,2022,the Yankees added Krook to their 40-man roster to protect him from the Rule 5 draft.[19] Krook was optioned to Triple-A Scranton/Wilkes-Barre to begin the 2023 season.[20] He transitioned into a relief pitcher in 2023.[21] In 12 games,Krook registered a 1.04 ERA with 34 strikeouts in 17+1⁄3 innings pitched.
On May 27, 2023, Yankees promoted Krook to the major leagues for the first time.[22] He went unused out of the Yankees bullpen and was optioned to Triple-A Scranton on June 1, becoming a phantom ballplayer.[23] On June 8, Krook was recalled after Nestor Cortés was placed on the injured list.[24] On June 16 at Fenway Park, Krook made his major league debut. In four games for the Yankees, he pitched to a 24.75 ERA with three strikeouts across four innings pitched.
On February 18, 2024, the Yankees traded Krook to the Baltimore Orioles for cash considerations.[26] He was optioned to the Triple-A Norfolk Tides to begin the 2024 season.[27] He was recalled by the Orioles when Corbin Burnes was placed on the paternity list on June 28.[28] He returned to the Tides after surrendering a Wyatt Langford three-run homer in the eighth inning of an 11–2 loss to the Texas Rangers on June 30.[29][30] Krook was designated for assignment by the Orioles on July 30.[31] He cleared waivers and was sent outright to Norfolk on August 2.[32] Krook elected free agency following the season on November 4.[33]
Athletics
On November 15, 2024, Krook signed a minor league contract with the Athletics.[34] He made 12 appearances for the Triple-A Las Vegas Aviators, posting a 3-1 record and 3.21 ERA with 21 strikeouts over 14 innings of work. On May 16, 2025, the Athletics selected Krook's contract, adding him to their active roster.[35] In three appearances for the team, he recorded a 5.40 ERA with three strikeouts across 3+2⁄3 innings pitched. Krook was designated for assignment by the Athletics on May 27.[36]
Cleveland Guardians
On May 29, 2025, Krook was claimed off waivers by the Cleveland Guardians.[37] He made 30 appearances for the Triple-A Columbus Clippers, posting a 2-0 record and 3.18 ERA with 40 strikeouts over 34 innings of work. On November 6, Krook was removed from the 40-man roster and sent outright to Columbus; he subsequently rejected the assignment and elected free agency.[38]
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