Brett de Geus Bio
Brett de Geus is an American professional baseball pitcher currently listed as a free agent. Born on November 4, 1997, in Pleasanton, California, he has spent his career moving between several Major League Baseball organizations, working primarily as a relief pitcher. Over the course of his professional journey, de Geus has appeared in the big leagues for the Texas Rangers, Arizona Diamondbacks, Seattle Mariners, Miami Marlins, Toronto Blue Jays, and Philadelphia Phillies, while also spending time in independent baseball and various minor league affiliates.
Known for an unconventional delivery and a long history of roster movement, de Geus has carved out a journeyman profile across professional baseball. His career has included stints in independent Atlantic League clubs, Rule 5 draft selection, multiple waiver claims, and outright assignments, illustrating the unpredictable path many relief pitchers navigate at the top level of the sport.
Early Life and Background
Brett de Geus grew up in Pleasanton, California, where he attended Foothill High School. He was not selected in the 2015 Major League Baseball draft, which led him to continue his playing career at the collegiate level. Seeking to develop his skills further, de Geus enrolled at Cabrillo College in Aptos, California, where he joined the Seahawks baseball program.
At Cabrillo College, de Geus steadily progressed. As a freshman in 2016, he earned all-conference honors, a strong early indicator of his potential on the mound. Returning for his sophomore season in 2017, he posted a 9–3 record with a 1.94 earned run average over 16 games, including 14 starts. Those numbers helped put him on the professional radar and ultimately led to his selection in the 2017 MLB Draft.
Path to Baseball
Following his productive sophomore campaign at Cabrillo College, de Geus was selected in the 33rd round of the 2017 Major League Baseball draft by the Los Angeles Dodgers, with the 1,000th overall pick. He signed with the organization and made his professional debut the following year. His development through the Dodgers system showcased flashes of promise, particularly during the 2019 season, when he was recognized as an Arizona Fall League All-Star after a strong year across two minor league affiliates.
Brett de Geus Career
Early Career (2018–2019)
de Geus made his professional debut in 2018 with the Ogden Raptors, going 4–5 with a 7.26 ERA over 15 games, including 14 starts. The following year, he began with the Great Lakes Loons before being promoted to the Rancho Cucamonga Quakes in June. In 39 relief appearances between the two clubs, he posted a 6–2 record with a 1.75 ERA, striking out 72 batters over 61 and 2/3 innings. He was then named an Arizona Fall League All-Star. He was a non-roster invitee to 2020 spring training with the Dodgers but did not appear in a game that year due to the cancellation of the minor league season caused by the COVID-19 pandemic.
Texas Rangers and Arizona Diamondbacks (2020–2021)
On December 10, 2020, the Texas Rangers selected de Geus with the second pick in the Rule 5 draft. He made the Rangers’ Opening Day roster in 2021 and made his major league debut on April 1, 2021, surrendering three earned runs in one inning. He was designated for assignment on June 23, 2021, after posting an 8.44 ERA across 19 games.
On June 25, 2021, de Geus was claimed off waivers by the Arizona Diamondbacks. Over 28 relief appearances with Arizona, he went 3–2 with a 6.56 ERA and 15 strikeouts. He was designated for assignment on November 26 and later sent outright to the Triple-A Reno Aces.
Independent Baseball and Return to Affiliates (2022–2023)
Assigned to the Double-A Amarillo Sod Poodles to begin 2022, de Geus struggled to a 5.96 ERA in 17 appearances before being released on June 7, 2022. He signed with the York Revolution of the Atlantic League of Professional Baseball on June 22, 2022, and went 2–2 with a 6.43 ERA in 33 games. In 2023, he signed briefly with a Frederick Atlantic League team before his contract was purchased by the Kansas City Royals on May 11, 2023, and assigned to the Triple-A Omaha Storm Chasers. He posted a 4.86 ERA across 29 appearances split between Omaha and the Double-A Northwest Arkansas Naturals, electing free agency on November 6, 2023.
Seattle Mariners, Miami Marlins, and Toronto Blue Jays (2024)
On December 3, 2023, de Geus signed a minor league deal with the Seattle Mariners. He was selected to the major league roster on April 8, 2024, and pitched four times for Seattle before being optioned back to Tacoma on April 22. He was designated for assignment on August 2, 2024.
On August 5, 2024, de Geus was claimed off waivers by the Miami Marlins and optioned to the Triple-A Jacksonville Jumbo Shrimp. In 7 games with Miami, he compiled a 6.35 ERA before being designated for assignment on September 10. On September 12, 2024, he was claimed off waivers by the Toronto Blue Jays, where he posted a 15.43 ERA in two appearances.
Philadelphia Phillies Era (2025)
On January 10, 2025, de Geus was designated for assignment by Toronto following the signing of Jeff Hoffman. He was then traded to the Pittsburgh Pirates on January 15, 2025, claimed off waivers by Miami on February 27, and designated for assignment by the Marlins on March 30. On April 1, 2025, de Geus was claimed off waivers by the Philadelphia Phillies. He made one appearance for Philadelphia on May 29, allowing one run in two innings against the Atlanta Braves. He was designated for assignment on July 31, following the acquisition of Harrison Bader, sent outright to the Triple-A Lehigh Valley IronPigs on August 3, and released by the Phillies organization on August 17.
Brett de Geus Family
Personal Life
Publicly available information about Brett de Geus’s family life is limited. He was raised in Pleasanton, California, and there are no widely confirmed details regarding his spouse, children, parents, or other personal relationships.
2025 Season Performance
The 2025 season was another turbulent chapter in Brett de Geus’s career. He began the year navigating a series of transactions, moving from the Toronto Blue Jays to the Pittsburgh Pirates and back to the Miami Marlins, all before the regular season began. After being claimed by the Philadelphia Phillies in April, he was eventually called up to the major league club and made one appearance on May 29, allowing one run in two innings against the Atlanta Braves.
de Geus’s time with the Phillies ended on July 31, when he was designated for assignment following the team’s acquisition of outfielder Harrison Bader. He cleared waivers and was sent outright to the Triple-A Lehigh Valley IronPigs on August 3 before being released by the organization on August 17, 2025. As of the most recent updates, Brett de Geus remains a free agent, with no announced plans for the remainder of the 2025 season or beyond.