Bryan Joseph Woo was born on January 30, 2000, in Oakland, California. He has one sister. Woo attended Alameda High School in Alameda, California. As a Senior in 2018, Woo ranked nationally in the Top 1000 prospects, and 831 for right-handed pitchers. He was also a Top 300 prospect in the state of California, ranking 84th among RHP. His senior year, Woo was a two-way player going 8-2 with a 1.25 ERA on the mound and hitting .422 while playing Shortstop. The summer after his senior season, he played for the Peninsula Oilers in the Alaska Summer League, where he’d go 2-3 with a 5.92 ERA. He pitched in 7 games and threw 24.1 innings and 24 Ks. He committed to play college baseball and pitch for Cal Poly.
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Bryan Woo College
In his first season at Cal Poly, Woo appeared in 14 games, starting 4 and pitching to an 8.75 ERA. He went 1-2 in 23.2 innings and struck out 27 batters. That summer, he returned to play for the Oilers, going 1-1 with a 4.62 ERA, appearing in six games, four starts. Woo fanned 36 in 25.1 innings. His Sophomore season was cut short due to COVID, as he appeared in seven games, throwing 17.2 innings. In his final season in 2021, Woo went 2-2 with a 6.11 ERA over 28 innings. He appeared in 10 games, including two starts. His final season (2021) was cut short due to Bryan Woo having to undergo Tommy John Surgery.
Bryan Woo Draft
The Seattle Mariners selected Woo in the sixth round with the 174th overall selection of the 2021 Major League Baseball draft. Woo signed with the Mariners for $318,200, slightly above the $286,500 slot value of the draft pick.
Bryan Woo Professional Tenure
2022
After recovering from Tommy John Surgery, Woo would make his professional debut in June 2022. He started out with the Arizona Complex League Mariners. There, he posted a 0.00 ERA across 4.2 innings and three starts and striking out nine. He was promoted to the Low-A Modesto Nuts later that month and continued to find some success. While in Modesto, Woo posted a 3.98 ERA across six starts and 20.1 innings, fanning 29 batters. By the end of July, Woo had been promoted again, this time to the High-A Everett AquaSox. He would finish the season with Everett with a 1-3 record and a 4.78 ERA across seven starts and 32 innings. Across 16 starts for the three clubs, Woo went 1-4 with a 4.11 ERA with 84 strikeouts in 57 innings. He would play for the Peoria Javelinas in the Arizona Fall League after the season finished.
2023
Woo would start 2023 with the Double-A Arkansas Travelers. In nine starts, he had a 3–2 record and 2.05 ERA with 59 strikeouts in 44 innings pitched. The Mariners announced that Woo would be promoted to the major leagues on June 2nd, to start the following day against the Texas Rangers. He started in place of Marco Gonzales. In his debut, Woo gave up six runs over two innings of work. One of his worst starts of the season. It wasn’t until his fourth start that he’d pick up his first win against the New York Yankees on June 22nd. In his rookie season, Woo would finish with a 4–5 record and 4.21 ERA, striking out 92 batters in 87.2 innings.
2024
Woo struggled with injuries in 2024, but still found some success, ending the season with a 9–3 record and 2.89 ERA, striking out 101 batters in 121.2 innings over 21 starts. These were all improvements from his rookie season. He had only walked 2.6 percent of the batters he faced that season.
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2025
Bryan Woo was the Mariners’ most consistent starter to start the season in 2025. He’d go at least six innings in each of his first 18 starts and was named to the American League All-Star team. On July 10, he would take a no-hit bid into the eighth inning against the Yankees.
