Brett de Geus

Brett de Geus (born November 4, 1997) is an American professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). He has previously played in MLB for the Texas Rangers and Arizona Diamondbacks.

Amateur career
De Geus attended Foothill High School in Pleasanton, California. He was not selected in the 2015 Major League Baseball draft, and thus enrolled at Cabrillo College in Aptos, California, where he played college baseball. As a freshman at Cabrillo in 2016, de Geus earned all-conference honors. As a sophomore in 2017, he went 9–3 with a 1.94 ERA over 16 games (14 starts).

Los Angeles Dodgers
After the season, de Geus was selected by the Los Angeles Dodgers in the 33rd round, with the 1,000th overall selection, of the 2017 Major League Baseball draft. De Geus signed with the Dodgers and made his professional debut in 2018 with the Ogden Raptors, going 4–5 with a 7.26 ERA over 15 games (14 starts). In 2019, he began the year with the Great Lakes Loons before being promoted to the Rancho Cucamonga Quakes in June. Over 39 relief appearances between the two clubs, he pitched to a 6–2 record with a 1.75 ERA, striking out 72 over $61 2/3$ innings. Following the season, he was selected to play in the Arizona Fall League, where he was named an All-Star.

De Geus was a non-roster invite to 2020 spring training. de Geus did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.

Texas Rangers
The Texas Rangers selected de Geus with the second pick in the 2020 Rule 5 draft. He made the Rangers' Opening Day roster in 2021. On April 1, 2021, de Geus made his major league debut, surrendering three earned runs in one inning pitched. De Geus was designated for assignment on June 23, 2021, after posting a 8.44 ERA over 19 games for Texas.

Arizona Diamondbacks
On June 25, 2021, de Geus was claimed off waivers by the Arizona Diamondbacks. Over 28 relief appearances with the Diamondbacks, he went 3–2 with a 6.56 ERA and 15 strikeouts. On November 26, 2021, de Geus was designated for assignment. He cleared waivers and was outrighted to the Triple-A Reno Aces on November 30.

De Geus was assigned to the Double-A Amarillo Sod Poodles to begin the 2022 season. He made 17 appearances for the team, struggling to a 5.96 ERA and 2–1 record with 16 strikeouts in 22.2 innings pitched. On June 7, 2022, de Geus was released by the Diamondbacks organization.

York Revolution
On June 22, 2022, de Geus signed with the York Revolution of the Atlantic League of Professional Baseball (ALPB). In 33 games, he went 2–2 with a 6.43 ERA and 31 strikeouts in 35 innings. He became a free agent following the season.

Frederick Atlantic League Team
On April 21, 2023, de Geus signed with the unnamed Frederick team in the ALPB. In five relief appearances for Frederick, de Geus registered a 3.00 ERA with six strikeouts in six innings pitched.

Kansas City Royals
On May 11, 2023, de Geus' contract was purchased by the Kansas City Royals organization and was assigned to the Triple-A Omaha Storm Chasers. In 29 appearances split between Omaha and the Double–A Northwest Arkansas Naturals, he accumulated a 4.86 ERA with 36 strikeouts across $46 1⁄3$ innings pitched. de Geus elected free agency following the season on November 6.

Seattle Mariners
On December 3, 2023, de Geus signed a minor league deal with the Seattle Mariners. He made three appearances for the Triple–A Tacoma Rainiers before he was selected to the major league roster on April 8, 2024.