He and his wife, Sydney, were married during the 2024-25 offseason...The two have a white Labrador retriever named Goose...Attended Great Oak High School in Temecula, Calif...Was named team captain his senior year and earned a Riverside County All-Star Team selection...Posted a 1.81 ERA over 50 innings pitched as a senior...His father, Brian, has participated in four Ironman competitions and works as a firefighter...Seymour credits his father as the biggest influence in his life.
2025
Pitched 16 games (three starts) in what was his debut MLB season...Went 1-3 with a 4.75 ERA (19 ER, 36.0 IP), 26 strikeouts and a 1.39 WHIP...Began the season in Triple-A, pitching 16 total games (15 starts)...Went 4-8 with a 3.86 ERA (33 ER, 77.0 IP), 90 strikeouts and a 1.34 WHIP...Was named a 2025 Pacific Coast League All-Star following the season...Was much better in relief, pitching to a 3.38 ERA (10 ER, 26.2 IP) in 13 games out of the bullpen for SF...Also fared much better on the road (3.18 ERA in seven games, one start) than at home (6.16 ERA in nine games, two starts)...Allowed nine homers over 36.0 MLB innings (2.25 HR/9 IP)...Opponents were 5-for-31 (.161) against his four-seamer with two homers and eight strikeouts...Recalled from Triple-A Sacramento on June 27 and made his big league debut on June 29 at Chicago-AL, pitching one scoreless inning of relief...Optioned to Triple-A on July 2 and recalled on July 22...Appeared in just one game with Sacramento in that span...Made his first big league start on Aug. 30 vs. Baltimore...In three starts with SF, he had an 8.68 ERA (nine ER, 9.1 IP) and .325 BAA.
2024
Was a non-roster invite to Major League Spring Training for the first time in his career...Appeared in four Spring Training games for SF (all relief outings), giving up four runs in 5.0 innings with six strikeouts...Spent the entire season with Triple-A Sacramento... Went 7-10 with a 4.82 ERA (72 ER, 134.1 IP) in 29 games (28 starts) with the River Cats...Seymour struck out 132 batters over 134.1 innings...His 132 strikeouts were third-most in the PCL and tied for ninth-most at the Triple-A level...His 134.1 innings were a career high, besting his previous high from 2023, when he threw 112.2 innings at Double-A Richmond...In four starts with the River Cats in June, the right-hander went 2-1 with a 1.31 ERA (three ER, 20.2 IP) and held opponents to a .173 BA (13-for-75)...Fared much better at home in Sutter Health Park in Sacramento...Logged a 3.92 ERA (28 ER, 64.1 IP) in 13 games (13 starts) with a 1.45 WHIP...On the road, Seymour had a 5.66 ERA (44 ER, 70.0 IP) in 15 starts with a 1.69 WHIP...Was added to SF’s 40-man roster on Nov. 11 ahead of the Rule 5 Draft.
2023
Spent the entire season pitching for Double-A Richmond...went 5-3 with a 3.99 ERA, 114 strikeouts and a 1.23 WHIP in a career-high 112.2 innings. Named the Eastern League Pitcher of the Week on Aug. 6 with Richmond...allowed just one hit while striking out nine across 5.0 shutout innings on Aug. 1 at Altoona to win the award. Finished with the eighth-best ERA (3.99), the fourth-best WHIP (1.23) and the fourth-best opposing batting average (.231) in the Eastern League. Posted a 1.96 ERA in six May games (three starts) with 14 strikeouts, a 1.09 WHIP and a .217 opposing batting average across 23.0 innings.
2022
In seven games (four starts) with Single-A St. Lucie, went 4-0 with a 1.19 ERA (four ER, 30.1 IP), 27 strikeouts and a .209 BAA...Joined the Giants on Aug. 2, 2022 as part of the return in the trade that sent Darin Ruf to the Mets.
