Carson Seymour
Carson James Seymour is an American professional baseball pitcher for the San Francisco Giants of Major League Baseball. He made his MLB debut in 2025.
Career
Amateur
Seymour attended Great Oak High School in Temecula, California and played college baseball at Dartmouth College and Kansas State University. In 2019, he played collegiate summer baseball with the Harwich Mariners of the Cape Cod Baseball League. In 2020, he played with the Rockford Rivets of the Northwoods League in a COVID-19 pandemic-restricted pod circuit.New York Mets
Seymour was drafted by the New York Mets in the sixth round, with the 172nd overall selection, of the 2021 [Major League Baseball draft]. He made his professional debut in 2021 with the rookie-level Florida Complex League Mets.Seymour began the 2022 campaign with the Single-A St. Lucie Mets, posting a 4-0 record and 1.19 ERA with 27 strikeouts in seven games. Following a promotion to the High-A Brooklyn Cyclones, he logged a 1-5 record and 3.68 ERA with 65 strikeouts over 11 games.
San Francisco Giants
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. He started his Giants career with the High-A Eugene Emeralds. In 2023, Seymour pitched for the Double-A Richmond Flying Squirrels, registering a 5-3 record and 3.99 ERA with 114 strikeouts in innings pitched across 28 appearances.Seymour spent the 2024 campaign with the Triple–A Sacramento River Cats, making 29 appearances and posting a 7–10 record and 4.82 ERA with 132 strikeouts across innings pitched. Following the season, the Giants added Seymour to their 40-man roster to protect him from the Rule 5 draft.
Seymour was optioned to Triple-A Sacramento to begin the 2025 season. In 15 starts for the River Cats, he compiled a 3–8 record and 3.89 ERA with 83 strikeouts over 74 innings of work. On June 27, 2025, Seymour was promoted to the major leagues for the first time. He made his MLB debut on June 29. On September 5, Seymour recorded his first career win, allowing one run over five innings pitched against the St. Louis Cardinals. Seymour made 16 appearances for San Francisco during his rookie campaign, in which he posted a 1–3 record and 4.75 ERA with 26 strikeouts over 36 innings.