Bryan Woo is the Seattle Mariners right-hander who has quietly built himself into one of the most dependable starters in the American League. Since his MLB debut on June 3, 2023, the Oakland native has done his talking on the mound — and the numbers back it up: a 2.94 ERA, 198 strikeouts, and a 0.93 WHIP across 186.2 innings in 2025.
Quick Facts
- Full name: Bryan Woo
- Position: Starting Pitcher
- Team: Seattle Mariners
- Number: 22
- Bats / Throws: Right / Right
- Height / Weight: 6’2″ / 205 lbs
- Born: January 30, 2000 (age 26), Oakland, CA 🇺🇸
- MLB Debut: June 3, 2023
Background
Woo grew up in Oakland, California — a city with deep baseball roots — and developed into a pitching prospect through the minor leagues, where his combination of velocity and movement caught Seattle’s eye early. When the Mariners called him up in June 2023, he didn’t need a long Triple-A audition. He stepped into the big leagues and never really looked back.
Career Breakdown
Woo’s 2024 season confirmed he belonged in a major-league rotation. He posted a 2.89 ERA over 121.1 innings, striking out 101 batters while going 9-3. The command was already elite — his 0.90 WHIP that year was a sign of things to come.
Then came 2025, his breakout. Woo went 15-7, threw 186.2 innings, and racked up a career-high 198 strikeouts. His 0.93 WHIP put him in the conversation with the best pitchers in the AL. No individual hardware yet — no Cy Young — but he was firmly on the radar of analysts and fans alike as one of the most promising young arms in the league.
2026 brought a tougher stretch: a 4.56 ERA, a 7-8 record, and 122 strikeouts in 120.1 innings. Even the sharpest pitchers go through adjustment periods, and Woo’s track record suggests he’s equipped to work through it.
Career Stats
- 2026 — Seattle Mariners: 7-8, 4.56 ERA, 122 K, 1.15 WHIP, 120.1 IP
- 2025 — Seattle Mariners: 15-7, 2.94 ERA, 198 K, 0.93 WHIP, 186.2 IP
- 2024 — Seattle Mariners: 9-3, 2.89 ERA, 101 K, 0.90 WHIP, 121.1 IP
What Makes Him Tick
Woo keeps a low profile off the field — quieter on social media than most players his age — but that seems to be by design. His focus is on refining his arsenal and helping Seattle stay competitive in the AL West. The numbers on the mound do the talking, and so far, they’ve been saying plenty.
