Bryan Woo was supposed to be one of the feel-good stories of the 2026 Seattle Mariners season. Coming off a 2025 All-Star selection and entering May with a gleaming 2.25 ERA, the 26-year-old right-hander looked like the anchor of a rotation that could carry Seattle deep into October. Then April 25 happened. Then May 1 happened. And suddenly, one of the American League's best pitchers is searching for answers before a critical start against the Atlanta Braves on May 6 — with a brand-new catcher behind the plate to boot.
The story of Woo's back-to-back disasters isn't just about a rough patch. It's about a specific, identifiable mechanical problem that turned one of his best weapons into a liability — and whether a 26-year-old ace with a track record of excellence can course-correct fast enough to matter.
Two Starts That Changed Everything
The numbers are stark. Woo allowed 7 earned runs on 9 hits — including 4 home runs — in just 3 innings against the St. Louis Cardinals on April 25. Six days later, he gave up 6 earned runs on 7 hits, including 2 more home runs, in 6 innings against the Kansas City Royals. In the span of nine days, Woo's ERA ballooned from 2.25 to 4.61.
That's not a slump. That's a cliff. And when you look at the underlying data, the cause is narrower — and more fixable — than the final lines suggest.
The culprit is Woo's two-seam fastball, a pitch that had been a weapon and became a liability almost overnight. Opponents are hitting .317 against it this season and slugging a brutal .561, with three of his six home runs allowed coming on that pitch alone. Woo went from a pitcher who could generate weak contact with his two-seamer to one who was essentially serving it up for extra bases.
The Specific Mechanical Problem Dan Wilson Identified
According to analysis from MyNorthwest's Ryan Rowland-Smith, the issue is location — specifically the location of Woo's two-seam fastball. Manager Dan Wilson identified this as the primary thing Woo needs to correct.
The two-seamer is a pitch designed to run in on right-handed hitters and generate ground balls when placed down and inside. It's a pitch that lives and dies by command. When you throw it in the middle of the strike zone — or worse, middle-out — you're essentially handing hitters a fastball with a slight arc that makes it even easier to square up. That's what's been happening to Woo. The pitch isn't breaking into the location it needs to reach to be effective; it's catching too much of the plate at a height that hitters can drive.
For a pitcher who built his 2025 All-Star case largely on the effectiveness of that two-seamer in combination with his breaking stuff, this is more than a cosmetic problem. It's a signature pitch gone rogue. But here's the flip side: location issues are mechanical issues, and mechanical issues — unlike stuff disappearing — can be fixed. The question is whether Woo can fix it mid-season, under pressure, in a game against a dangerous Braves lineup.
Woo himself didn't sugarcoat it. He described his recent outings as simply getting his "ass kicked" — a refreshingly honest assessment that at least suggests he's not in denial about what's happening.
The Cal Raleigh Factor: Catching Without Your Anchor
Even if Woo works out the mechanical kinks in his two-seamer, he'll be doing it without the catcher he knows best. Cal Raleigh — the Mariners' All-Star catcher and one of the best pitch-framers in baseball — is dealing with right side soreness that has him limited to designated hitter duties. He won't be behind the plate for the Braves game.
In his place: Jhonny Pereda, recalled from Triple-A Tacoma on May 2, who started his first game with the Mariners against the Royals on May 3. The May 6 start against Atlanta will be Woo and Pereda's first major league game together as a battery.
This matters more than casual fans might realize. The pitcher-catcher relationship is one of the most undervalued dynamics in baseball. A catcher who knows a pitcher's tendencies — what pitches are working on a given day, what sequences have been getting hitters out, when to call for something off-speed to reset a hitter's timing — can be worth fractions of an ERA over a season. Pereda is not Cal Raleigh. He's a capable backup on a short track record at the major league level, but asking him to immediately sync up with a struggling ace against a quality lineup is a significant ask.
That said, there's a small counterintuitive argument here: sometimes a new catcher can help. If Woo has been getting into bad habits in his sequences with Raleigh — if there's been a comfort level that's become predictability — a fresh set of eyes might call the game differently. It's unlikely to be the decisive factor, but it's worth watching how Pereda calls the game and whether Woo's pitch mix shifts at all.
Atlanta Braves: Not the Opponent You Want When You're Struggling
If Woo needed a soft landing to rebuild his confidence, the Braves are not it. Atlanta enters this series as one of the National League's more dangerous offenses, with a lineup capable of punishing any pitcher who misses location — exactly the issue Woo has been dealing with.
The Braves have strong contact hitters throughout their order who can cover multiple pitch types and locations. If Woo is going to try to lean on a two-seamer that's been leaking middle-middle, Atlanta's hitters have the patience and power to make him pay. The matchup almost feels like a test: Woo either proves the Cardinals and Royals outings were aberrations that he's corrected, or the Braves confirm there's something more stubborn going on.
For the Mariners heading into game 38 of their season, the stakes extend beyond one start. Seattle needs its ace to be an ace, and a third consecutive implosion would raise serious questions about the rotation going forward.
Context: Who Bryan Woo Is and Why This Matters
It's worth taking a step back and remembering that Bryan Woo is 26 years old and was an All-Star last season. Two bad starts do not erase that. But they do demand explanation, because Woo's 2025 performance wasn't a fluke — it was built on real stuff, real command, and a real ability to miss bats and generate weak contact.
Woo's rise with the Mariners has been one of the more compelling pitcher development stories in baseball over the past two years. He's not a power pitcher in the traditional sense — he works with a combination of fastball shapes, a slider, and the ability to change eye levels and tunnels to keep hitters guessing. That complexity makes his two-seamer command even more important: when you're not just blowing hitters away with velocity, every pitch needs to be doing a specific job. A two-seamer that catches the plate middle-high is doing nobody's job.
The Mariners built their rotation around the idea that you don't need one ace if you have four or five quality starters. Woo has been the closest thing to a genuine top-of-rotation guy. If he's in a mechanical spiral, it has downstream effects — on the bullpen, on the team's ability to hold leads, on the entire Seattle ethos of pitching-first baseball. This is also the kind of situation where comparing notes with a teammate like a fellow starting pitcher navigating physical setbacks could matter for a young ace learning how to manage adversity at the big league level.
What This Means: Analysis of Woo's Path Forward
Here's the honest assessment: Bryan Woo is not broken. He's experiencing what happens when a key pitch loses its location and opponents — particularly power-heavy lineups — punish you for it. The Cardinals hit four home runs off his two-seamer. The Royals hit two more. That's six of his six home runs allowed this season, and the sample is small enough that it doesn't necessarily represent a permanent skill regression.
But the path forward requires two things happening simultaneously. First, Woo needs to actually fix the command on that two-seamer. Dan Wilson's identification of location as the issue is the first step — the organization knows what's wrong. Whether the fix is mechanical (a grip adjustment, a release point tweak) or mental (trusting the pitch and not overthinking it) will determine how quickly he can solve it.
Second, and more importantly for tonight's start, Woo may need to temporarily de-emphasize the two-seamer while he works on it. Elite pitchers adjust. If his two-seamer isn't reliable right now, he has other weapons — his slider has been sharp, and he can live on the four-seamer and breaking stuff while rebuilding confidence in that pitch. The worst thing he can do is keep going back to a pitch that's getting him hurt, hoping it will magically work.
The Pereda question is a wildcard. Their first game together could be rough simply because of the communication gap. Or Pereda could call a fresh game plan that gets the best out of Woo's current arsenal. Either way, the Mariners made the right call bringing in someone from the system rather than leaving Raleigh in physical jeopardy behind the plate.
The bigger picture: Woo is young enough that a two-start correction is entirely plausible. He's shown over a full season that he can be one of the league's better starters. The version of Woo who posted a 2.25 ERA through his first several starts this season is the real version. The version from April 25 and May 1 is what happens when one pitch goes wrong and a good lineup doesn't let you get away with mistakes. The May 6 start is about which version shows up — and whether he's been honest enough with himself and his coaches to make a real adjustment.
Frequently Asked Questions
What is Bryan Woo's current ERA for the 2026 season?
Woo's ERA sits at 4.61 after two consecutive poor starts. Before those starts — against the Cardinals on April 25 and the Royals on May 1 — his ERA was 2.25, reflecting an otherwise strong beginning to his season.
Why has Bryan Woo struggled in his last two starts?
Analysts and Mariners manager Dan Wilson have pinpointed location issues with Woo's two-seam fastball as the primary cause. Opponents are hitting .317 and slugging .561 against the pitch this season, with three home runs allowed on it. When the two-seamer catches too much of the plate rather than running in on hitters at the desired location, it becomes a pitch that's easy to barrel up.
Who is catching for Bryan Woo against Atlanta on May 6?
Jhonny Pereda, recalled from Triple-A Tacoma on May 2, will catch Woo against the Braves. Regular catcher Cal Raleigh is limited to designated hitter duties due to right side soreness. It will be the first major league game Woo and Pereda have worked together as a battery.
Is Bryan Woo's job or rotation spot in danger?
No. Woo is a 2025 All-Star who opened this season with a 2.25 ERA before a two-start rough patch. The Mariners are clearly working with him on a mechanical fix rather than making roster moves. Two bad starts do not undo the evidence of his quality — but a third consecutive disaster would put the organization in a more difficult position regarding the rest of the rotation.
What is the significance of the May 6 Mariners vs. Braves game for Woo?
This start serves as a pivotal moment for Woo's season narrative. It's his first chance to demonstrate that the back-to-back poor outings were a correctable blip rather than the beginning of a deeper issue. Doing it against a quality Atlanta lineup, with a new catcher, adds significant weight to whatever the outcome turns out to be.
The Bottom Line
Bryan Woo is not in a crisis — he's in a correction. The difference matters. A crisis implies something fundamental is broken; a correction implies something specific is wrong and identifiable. The Mariners, Woo himself, and the available data all point to the same culprit: a two-seam fastball that's been too middle of the plate, at too hittable a height, against lineups that punished every mistake.
The May 6 start against Atlanta is a referendum on whether Woo can make that correction under game conditions, with a new catcher, against a real opponent. If he can keep the ball down, rediscover the tunnel and command that made his two-seamer a weapon earlier this season, and trust his slider and four-seamer to do work while he rebuilds confidence, the 2.25 ERA version of Bryan Woo can return. The Mariners need that version. Their rotation depth and October hopes run through him.
What makes Woo's self-awareness — bluntly admitting he's been getting his "ass kicked" — actually encouraging is that it suggests he's not rationalizing. A pitcher in denial makes the same mistakes. A pitcher who knows he got beaten, knows why, and is actively working on it is a pitcher who can get right. Whether "right" comes tonight or next week is the only real question left.
