Carson Seymour

Carson James Seymour Bio

Carson James Seymour is an American professional baseball pitcher who currently plays for the San Francisco Giants of Major League Baseball (MLB). Born on December 16, 1998, in Temecula, California, Seymour developed his skills at Great Oak High School before advancing to play college baseball at Dartmouth College and Kansas State University. The New York Mets selected him in the sixth round of the 2021 MLB Draft with the 172nd overall pick. After being traded to the San Francisco Giants in August 2022, Seymour worked his way through the minor leagues before making his MLB debut on June 29, 2025.

Early Life and Background

Carson James Seymour grew up in Temecula, California, where he attended Great Oak High School. During his high school years, he developed into a promising baseball pitcher, attracting attention from college programs across the country. His performance on the mound earned him an opportunity to continue his baseball career at the collegiate level.

Seymour initially enrolled at Dartmouth College, where he played college baseball for the Big Green. He later transferred to Kansas State University to continue his collegiate career. His development as a pitcher continued to progress during these years, preparing him for the professional ranks.

Amateur Career

Before turning professional, Seymour gained additional experience playing summer collegiate baseball. In 2019, he played for the Harwich Mariners of the Cape Cod Baseball League, one of the most prestigious summer leagues for college players. The following year, in 2020, he played for the Rockford Rivets of the Northwoods League during a season impacted by COVID-19 pandemic restrictions. These summer league appearances helped Seymour refine his pitching skills and build his reputation among scouts.

Path to Professional Baseball

The New York Mets selected Carson Seymour in the sixth round of the 2021 Major League Baseball Draft with the 172nd overall selection. This draft position represented the culmination of his development from high school through college baseball. The Mets saw potential in his pitching ability and selected him to join their organization. He made his professional debut in 2021 with the rookie-level Florida Complex League Mets, beginning his journey through the minor leagues toward the major leagues.

Carson James Seymour Career

Minor League Development (2021–2024)

Seymour began his professional career in 2021 with the Florida Complex League Mets following the draft. He spent the 2022 season advancing through the Mets minor league system, beginning with the Single-A St. Lucie Mets. With St. Lucie, he posted an impressive 4-0 record with a 1.19 earned run average and 27 strikeouts in seven games (four starts). Following his strong performance, he earned a promotion to the High-A Brooklyn Cyclones, where he recorded a 1-5 record with a 3.68 ERA and 65 strikeouts across 11 games (nine starts).

On August 2, 2022, the Mets traded Seymour along with J. D. Davis, Thomas Szapucki, and Nick Zwack to the San Francisco Giants in exchange for Darin Ruf. He joined the Giants organization and finished the 2022 season with the High-A Eugene Emeralds. In 2023, Seymour pitched for the Double-A Richmond Flying Squirrels, where he registered a 5-3 record with a 3.99 ERA and 114 strikeouts in 112 and two-thirds innings pitched across 28 appearances (23 starts). His consistent performance at the Double-A level demonstrated his readiness for higher competition.

Seymour advanced to the Triple-A level in 2024, spending the season with the Sacramento River Cats. He made 29 appearances (28 starts) and posted a 7-10 record with a 4.82 ERA and 132 strikeouts in 134 and one-third innings pitched. Following the 2024 campaign, the San Francisco Giants added Seymour to their 40-man roster to protect him from the Rule 5 Draft, signaling their commitment to his development.

MLB Debut and Rookie Season (2025)

The San Francisco Giants optioned Seymour to Triple-A Sacramento to begin the 2025 season. He made 15 starts for the River Cats, compiling a 3-8 record with a 3.89 ERA and 83 strikeouts over 74 innings of work. On June 27, 2025, the Giants promoted Seymour to the major leagues for the first time in his career. He made his MLB debut on June 29, 2025.

On September 5, 2025, Seymour recorded his first career win, allowing one run over five innings pitched against the St. Louis Cardinals. This milestone represented a significant achievement in his professional career. For his rookie campaign, Seymour made 16 appearances (three starts) for San Francisco, posting a 1-3 record with a 4.75 ERA and 26 strikeouts over 36 innings pitched.

2026 Season

The Giants optioned Seymour to Triple-A Sacramento to begin the 2026 season, continuing his development in the minor leagues while maintaining his connection to the major league roster. Through June 10, 2026, he had appeared in multiple games for the River Cats, working to refine his craft at the Triple-A level.

Notable Achievements

Seymour reached the major leagues in 2025 after four seasons in the minor leagues, demonstrating consistent improvement at each level. His first career win against the St. Louis Cardinals represented a defining moment in his early professional career. His progression from the 2021 draft to MLB debut within four years highlighted his dedication to developing his skills.

Carson James Seymour Career Statistics

Through June 10, 2026, Seymour has compiled limited MLB statistics during his rookie season with the San Francisco Giants. His minor league career has shown consistent performance across multiple levels of competition.

Major League Baseball Highlights

Seymour made his MLB debut on June 29, 2025, with the San Francisco Giants. He recorded his first career win on September 5, 2025, against the St. Louis Cardinals, a memorable milestone in his professional journey. Across his rookie season, he appeared in 16 games with three starts, demonstrating his versatility as both a starter and reliever at the major league level.

Minor League Highlights

Throughout his minor league career from 2021 to 2024, Seymour showed steady improvement at each classification. His standout minor league season came in 2023 with Double-A Richmond, where he recorded 114 strikeouts in 112 and two-thirds innings. His 2024 campaign with Triple-A Sacramento saw him lead the River Cats in strikeouts with 132 punchouts across 134 and one-third innings.

Carson James Seymour Family

Personal Life

Carson Seymour married Sydney Campbell in 2024. The couple share their home with a white Labrador retriever named Goose. Seymour continues to maintain connections to his California roots while pursuing his professional baseball career with the San Francisco Giants organization.