The Seattle Mariners continued to showcase one of baseball’s most reliable pitching staffs Thursday, and Bryan Woo added another impressive accomplishment to his growing resume with a dominant start against the Baltimore Orioles.
Woo overwhelmed one of the American League’s more dangerous lineups, working seven scoreless innings in the Mariners’ shutout win. The 26-year-old allowed three hits, struck out nine batters, and issued only one walk while needing just 89 pitches to earn the win.
Beyond the final score, Woo’s outing carried historic significance. He retired 21 of the first 23 batters he faced and struck out five consecutive Orioles during one overpowering stretch. An early three-run cushion gave him enough support, but the right-hander was in command throughout the afternoon.
Following the victory, OptaSTATS shared the achievement on X, formerly Twitter, after the right-hander secured another command-driven milestone.
“Bryan Woo has a 5.0 K/BB ratio through his first 4 MLB seasons after today’s win over the Orioles.
The only pitchers in MLB history to post a K/BB ratio of 5.0 or better through 4 big-league seasons (min. 400 IP) are George Kirby (2022-25), Shane Bieber (2018-21), Masahiro Tanaka (2014-17) and Tommy Bond (1876-79).”
Bryan Woo has a 5.0 K/BB ratio through his first 4 MLB seasons after today's win over the Orioles.
The only pitchers in MLB history to post a K/BB ratio of 5.0 or better through 4 big-league seasons (min. 400 IP) are George Kirby (2022-25), Shane Bieber (2018-21), Masahiro… pic.twitter.com/BoXDmtTqDp
— OptaSTATS (@OptaSTATS) June 18, 2026
That exclusive company shows how special Woo’s command has become. A 5.0 strikeout-to-walk ratio means a pitcher records five strikeouts for every walk allowed. Maintaining that standard across four MLB seasons and more than 400 innings reflects elite precision, not a brief run.
The accomplishment also reinforces the strength of Seattle’s pitching development. Remarkably, George Kirby and Woo now occupy two of the five spots on that all-time list, giving the club two homegrown examples of exceptional strike-throwing.
For the Mariners, the milestone extends beyond individual recognition. Woo continues establishing himself as a dependable frontline starter capable of leading a postseason-caliber rotation as the Mariners lean on pitching to drive their playoff push through the summer and into the most demanding stretch of the season.
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