Carson Seymour Bio
Carson James Seymour, born on December 16, 1998, is an American professional baseball pitcher who currently competes for the San Francisco Giants of Major League Baseball. He made his MLB debut in 2025 after rising through the New York Mets organization, where he was originally selected in the sixth round of the 2021 MLB Draft. A right-handed pitcher, Seymour has built his career on strikeout ability and durability, working his way from rookie ball to the major leagues over the course of five professional seasons.
Standing out as a starter across multiple minor league levels, Seymour became known for his power repertoire and his command on the mound. Following a trade to the Giants organization in 2022, he continued to develop within the minor leagues before earning his first call-up to the major leagues in the middle of the 2025 season. His path from college baseball at Dartmouth College and Kansas State University to a big-league roster spot reflects a steady and patient climb through professional baseball.
Early Life and Background
Carson James Seymour was born on December 16, 1998, in Temecula, California. He grew up in Southern California, where he attended Great Oak High School and began developing the skills that would eventually carry him to a professional baseball career. His upbringing in Temecula placed him in a region known for producing competitive amateur baseball talent, and he used that environment to refine his pitching craft during his formative years.
After completing high school, Seymour continued his academic and athletic career at Dartmouth College, a program with a strong tradition in the Ivy League. He later transferred to Kansas State University, where he played college baseball at a higher level of competition. These college years gave him exposure to more advanced hitting and pitching, helping him adjust to the rigors of higher-level baseball before entering the professional ranks.
During the summers, Seymour gained valuable experience in two of the country’s top collegiate summer leagues. In 2019, he played for the Harwich Mariners of the Cape Cod Baseball League, widely regarded as the premier summer league for college players. The following summer, in 2020, he suited up for the Rockford Rivets of the Northwoods League, where the season was run in a restricted pod format due to the COVID-19 pandemic. These experiences helped prepare him for the long season demands of professional baseball.
Path to Professional Baseball
Seymour’s professional path began when the New York Mets selected him in the sixth round, with the 172nd overall pick, of the 2021 Major League Baseball Draft. The Mets saw in him a projectable pitcher with a strong frame and a power arm, and they placed him with their rookie-level affiliate, the Florida Complex League Mets, to begin his development.
He made his professional debut in 2021 with the Florida Complex League Mets, getting his first taste of professional hitters in a controlled developmental setting. His time there allowed him to adjust to a professional schedule and refine his mechanics before being challenged at higher levels of the minor leagues.
Carson Seymour Career
Early Career (2021–2022)
Seymour began the 2022 season with the Single-A St. Lucie Mets and quickly impressed in his first extended look. In seven games, four of which were starts, he posted a 4–0 record and a 1.19 earned run average while striking out 27 batters, demonstrating both effectiveness and swing-and-miss stuff against younger competition.
Following that strong start, he was promoted to the High-A Brooklyn Cyclones, where the challenges of the next level became evident. Across 11 games and nine starts, he logged a 1–5 record and a 3.68 ERA while still managing to fan 65 batters, showing the kind of strikeout profile that suggested he could remain a starter as he moved up the ladder. On August 2, 2022, the Mets traded Seymour, J. D. Davis, Thomas Szapucki, and Nick Zwack to the San Francisco Giants in exchange for Darin Ruf, sending him to a new organization midway through the season.
San Francisco Giants Organization (2022–2024)
After the trade, Seymour began his Giants career with the High-A Eugene Emeralds, finishing the 2022 season within the Giants’ developmental pipeline. The change of organizations did not slow his progression, and by 2023, he had advanced to the Double-A Richmond Flying Squirrels, where he enjoyed a strong year.
With Richmond in 2023, Seymour made 28 appearances, 23 of which were starts, and recorded a 5–3 record and a 3.99 ERA. He struck out 114 batters over 112 and two-thirds innings, showing that he could handle the workload of a starting pitcher at the upper levels of the minors. That performance earned him a promotion to the Triple-A Sacramento River Cats for the 2024 season.
Seymour spent the entire 2024 campaign with Sacramento, where he made 29 appearances, including 28 starts, posting a 7–10 record and a 4.82 ERA while striking out 132 batters across 134 and one-third innings. Although the win-loss record did not reflect his overall workload, the strikeout total and innings pitched signaled that he was ready for an opportunity at the major league level. Following the season, the Giants added Seymour to their 40-man roster to protect him from being selected in the Rule 5 draft.
MLB Debut and Rookie Season (2025–Present)
Seymour was optioned to Triple-A Sacramento to begin the 2025 season, where he continued to refine his game with the River Cats. In 15 starts for Sacramento, he compiled a 3–8 record and a 3.89 ERA while striking out 83 batters over 74 innings, keeping himself in position for a major league opportunity.
On June 27, 2025, Seymour was promoted to the major leagues for the first time, and he made his MLB debut two days later on June 29. His first career win came on September 5, 2025, when he allowed just one run over five innings pitched against the St. Louis Cardinals. Across 16 appearances and three starts in his rookie campaign, he posted a 1–3 record and a 4.75 ERA with 26 strikeouts over 36 innings, gaining valuable experience at the highest level.
Driving Style and Strengths
Seymour is best known as a power pitcher with the ability to generate swings and misses at every level of the minor leagues. His strikeout totals at Richmond and Sacramento highlight his swing-and-miss profile, while his innings totals demonstrate the durability required of a starting pitcher. Working within the Giants’ player development system, he has leaned on his fastball and offspeed mix to navigate lineups across multiple levels.
Notable Events and Milestones
One of the defining moments of Seymour’s career came on September 5, 2025, when he earned his first major league win against the St. Louis Cardinals. His promotion to the 40-man roster after the 2024 season and his subsequent call-up in 2025 marked the culmination of a multiyear development process. Reaching the major leagues for the first time on June 29, 2025, also stands as a career milestone, completing his journey from the Florida Complex League to the highest level of professional baseball.
Carson Seymour Career Wins
Across his professional career, Carson Seymour has produced consistent results at every minor league level, with his most notable victory coming at the major league level. His first MLB win, recorded on September 5, 2025, against the St. Louis Cardinals, marked the arrival of a long-developing arm in the Giants’ system.
Minor League and Major League Highlights
Seymour’s first major professional win came during the 2022 season with the St. Lucie Mets, where he opened the year 4–0 with a 1.19 ERA in seven games. He has continued to log victories at every level since, with his most recent major league win coming during his 2025 rookie campaign with the Giants. Across his minor league career, he has been a regular winner in the developmental ranks, complementing his strikeout totals with consistent innings eaten at the Double-A and Triple-A levels.
Other Wins & Performances
Beyond his major league breakthrough, Seymour has been a dependable starter in the upper minors, particularly during his 2023 season at Richmond, where he posted a 5–3 record and struck out 114 batters. His 2024 campaign with Sacramento further cemented his reputation as a high-volume starter capable of handling Triple-A lineups, even as his win-loss record did not fully capture his workload.
Carson Seymour Family
Family Background and Racing Lineage
Carson Seymour was raised in Temecula, California, where he developed an early passion for baseball. He attended Great Oak High School before continuing his athletic career at Dartmouth College and Kansas State University, building a foundation rooted in both academics and competitive sport.
Personal Life
Carson Seymour married Sydney Campbell in 2024. The couple shares a white Labrador retriever named Goose, who has been mentioned as a familiar companion throughout his early major league career. Seymour continues to live a relatively private personal life, with his family supporting him as he navigates his first full major league seasons.
2025 Season Performance
Seymour’s 2025 season was split between Triple-A Sacramento and the major league club, beginning with the River Cats in a starting role. In 15 starts at Sacramento, he posted a 3–8 record and a 3.89 ERA with 83 strikeouts over 74 innings, working his way back into form after his 2024 Triple-A campaign. His consistency in the minors kept him firmly in the conversation for a major league opportunity.
That opportunity arrived on June 27, 2025, when he was promoted to the Giants for his MLB debut two days later. Over the course of his rookie year, he appeared in 16 games and made three starts, going 1–3 with a 4.75 ERA and 26 strikeouts in 36 innings. His first career win, earned on September 5 against St. Louis, served as a highlight of an otherwise developmental rookie season.
Looking ahead, Seymour was again optioned to Triple-A Sacramento to begin the 2026 season, where the Giants planned to continue his development. The early months of the year will likely be focused on refining his command and stretching his outings as a starter, with the goal of earning a more permanent role in the major league rotation. His combination of strikeout ability and innings capacity makes him a strong candidate to contribute to the Giants’ pitching staff in 2026 and beyond.
