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Hiromi Itoh has a real case for an MLB rotation spot. He limits walks, handles substantial workloads, and has put together a productive record with the Hokkaido Nippon-Ham Fighters. But being ready for an opportunity isn’t the same as being ready to lead a rotation. For me, the question is whether his strengths translate into dependable innings—or something more.
MLB.com reported on November 1, 2026, that the Fighters officially posted the right-hander, opening a 45-day window to sign with an MLB club. The 2025 Sawamura Award belongs on his résumé. So does his less dominant 2026 season. I’m not ignoring what he accomplished, but I’m not handing him an ace label before seeing how his pitching translates.
Hiromi Itoh’s Recent NPB Statistics
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Source: NPB’s official player record, through the end of the 2026 season. WHIP is calculated as hits plus walks divided by innings pitched and rounded to two decimal places. Fractional innings represent outs, not decimal fractions.
His Control Is the Selling Point
The first thing that stands out is how few hitters Itoh walks. In 2025, he struck out 195 batters and walked just 29 across 196⅔ innings. His strikeout rate was 24.5%, his walk rate was 3.6%, and the gap between them was 20.8 percentage points. That’s the foundation of his MLB case: getting outs without constantly giving hitters a free trip to first base.
In 2026, those rates moved to 21.8%, 4.7%, and 17.1 percentage points, respectively, calculated from NPB’s batters-faced totals. He still allowed only 1.77 walks per nine innings, but the margin narrowed. There’s also an important distinction here: throwing strikes doesn’t automatically mean locating every pitch where you want it. His walk totals tell us about control, not exactly how precise his command is or how effective his pitches will be against MLB hitters.
The 2026 Step Back Can’t Be Ignored
This wasn’t just an ERA increase. Itoh struck out a smaller share of hitters, walked a larger share, and allowed 184 hits in 172⅔ innings. In 2025, he allowed 179 hits in 196⅔ innings. More hits in fewer innings helped push his WHIP from 1.06 to 1.26. That’s a change worth taking seriously.
But taking it seriously doesn’t mean writing him off. Hit totals alone don’t tell us how much came from contact quality, defense, or normal variation. And an NPB ERA isn’t an MLB forecast. My point is simpler: his latest season gives me less reason to expect a frontline starter immediately than his award-winning 2025 campaign did.
My MLB Baseline: A Number 4 Starter With Number 3 Upside
I see Itoh as a Number 4 starter with Number 3 upside, not an immediate ace. There’s value in a pitcher who can handle innings and avoid piling up walks. What I still need to see is whether he can miss enough MLB bats and keep hitters from doing enough damage to hold that rotation spot over a full season.
If he stays healthy and gets a regular rotation opportunity, roughly 140–165 innings with a 3.80–4.40 ERA is my cautious illustrative range. That’s an editorial estimate, not a published projection model or a promise. His team, home ballpark, pitch translation, and adjustment to the MLB schedule could all move him outside it.
Shota Imanaga is a useful comparison because control is part of both pitchers’ appeal. But that’s where we need to look deeper. Limiting walks doesn’t make their profiles interchangeable.
A Bullpen Role Is Possible
MLB.com’s posting report relayed a scout’s concerns about Itoh’s consistency as a starter while noting
that he reached 94–96 mph in relief during a previous World Baseball Classic. That makes a bullpen fallback worth considering. It doesn’t mean he holds that velocity as a starter, and it doesn’t establish that he’ll succeed in an MLB bullpen. It’s a scouting possibility, not a result we’ve already seen.
Imanaga Is the Benchmark, Not a Guaranteed Blueprint
The biggest difference between Imanaga and Itoh is their ability to miss bats. In his final NPB season in 2023, Imanaga struck out 174 hitters in 148 innings, with a 29.2% strikeout rate and a 4.0% walk rate. Itoh’s stronger 2025 season came with a lower 2.52 ERA and a slightly better 3.6% walk rate, but his 24.5% strikeout rate still trailed Imanaga’s. In 2026, Itoh’s strikeout rate dropped to 21.8% while his walk rate rose to 4.7%. These seasons aren’t adjusted for league or ballpark differences, but the contrast matters: Imanaga’s stronger strikeout-minus-walk profile gave him more room for error entering MLB. A lower ERA by itself doesn’t settle the comparison.
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Itoh’s clearest edge is his recent NPB workload. He topped 170 innings in three straight seasons, including 196⅔ innings in 2025. Imanaga threw 143⅔ and 148 innings in his final two NPB campaigns. That gives Itoh a credible case for handling substantial starting responsibilities, although the MLB schedule is a different test. Both pitchers limit walks. Imanaga’s greater strikeout ability, however, gives him more ways to get out of trouble without depending on his defense or what happens when the ball is put in play.
Then there’s the most important difference: Imanaga has already done it in MLB. Itoh hasn’t. Imanaga’s 2.91 rookie ERA is an ambitious target, not the number I’d pencil in for Itoh. His later seasons in the upper threes offer a more measured aspirational benchmark, but Itoh would still have to prove his pitches can get MLB hitters out. I’m staying with a Number 4 starter baseline and Number 3 upside for Itoh. Imanaga has already shown he can deliver that level of production or better.
Key Takeaways
· Itoh finished 2026 with a 3.18 ERA, 159 strikeouts, and 34 walks in 172⅔ innings.
· Control is his selling point, but fewer strikeouts and more hits allowed in 2026 are reasons to keep expectations in check.
· My baseline is a No. 4 starter with No. 3 upside—an editorial assessment, not a model-based projection.
· A bullpen role remains a possibility if his pitches translate better in shorter outings.
In Conclusion
I like Itoh’s chances of providing useful MLB starting innings. I’m just not confusing that with a frontline guarantee. His 2025 season shows the mid-rotation upside; his 2026 season is the reason to keep the projection grounded. Start with dependable rotation production, then let his pitches—not his award résumé or someone else’s MLB success—tell us how much more is there.
Source notes: Season and career totals come from NPB’s official Hiromi Itoh player record. Posting news, the Sawamura Award, and the relief-velocity scouting observation come from MLB.com’s November 1, 2026 posting report. WHIP and percentage rates are calculated from the official totals; MLB role and performance ranges are editorial assessments.
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