Tatsuya Imai: The Hidden Ace Candidate MLB Teams Should Be Chasing

While Japanese superstar Munetaka Murakami is grabbing most of the headlines this offseason, there’s another name out of Japan quietly rising toward the top of MLB front offices’ wish lists — and he pitches, not hits.

Tatsuya Imai, a 27-year-old right-handed starter from the Saitama Seibu Lions, is expected to be posted soon, and he might just be MLB’s most overlooked potential ace.

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Elite Production in Japan — And Perfect Timing

Imai is coming off the best season of his professional career — and one of the best pitching campaigns in Nippon Professional Baseball this year:

• 1.92 ERA

• 0.89 WHIP

• 178 strikeouts in 163.2 innings

• 45 walks (2.5 BB/9, career best)

• 9.8 K/9 with a career-high 27.8% strikeout rate

He was named an NPB All-Star for the second straight season and even threw in a combined no-hitter, further solidifying his status as one of Japan’s top arms. The timing couldn’t be more ideal for a leap to Major League Baseball.

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Power Stuff + Command = Ace Potential

What separates Imai from most posting candidates is his mix of power, control, and pitch repertoire that already mirrors MLB success.

Pitch Arsenal & Velocity

• Four-seam fastball sits at 95 MPH and touches 98–99 MPH

• Wipeout slider — his most effective out pitch

• Splitter — used primarily to neutralize left-handed hitters

That’s front-of-the-rotation velocity paired with command, sequencing, and strikeout ability. Very few pitchers hit free agency — from any league — with that kind of profile.

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Why Isn’t He Being Talked About Like Yamamoto or Senga?

Simple: he doesn’t have the same international spotlight yet.

He isn’t a household name like Murakami, nor did he dominate the World Baseball Classic like Yoshinobu Yamamoto. But scouts rave privately about his competitiveness, quiet leadership, and MLB-ready repertoire.

He’s not a “developmental project.” He can slide into a big-league rotation on Opening Day.

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Projected Market & Teams Interested

Multiple contenders and large-market teams have already shown interest in Imai, including:

• Los Angeles Dodgers

• Boston Red Sox

• San Diego Padres

• New York Mets

He’s expected to command a deal in the $150–$200 million range over 5–6 years — comparable to past NPB aces like Kodai Senga and slightly below Yamamoto’s tier.

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Perfect Fit for Front or Middle of a Rotation

Given his velocity, command, and durability, Imai projects as either:

• A No. 1 or No. 2 starter on a rebuilding team, or

• A high-end No. 3 on a contender loaded with pitching depth

Either way, he upgrades a pitching staff the second his name is on a contract.

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Final Take: MLB’s Hidden Ace of 2025

While most eyes are fixed on Murakami’s power bat, the real under-the-radar prize this offseason might be Tatsuya Imai.

A 1.92 ERA, elite strikeout rates, upper-90s velocity, and command that keeps improving, he’s the type of pitcher that changes a franchise’s trajectory.

Murakami may be the headline.

But Imai might be the steal.