The Cardinals may have found a pitcher who fits the new mold in St. Louis: loud stuff, real upside, and plenty of risk baked into the package.
That’s why Brandon Clarke is starting to draw attention. The left-hander, acquired from the Boston Red Sox in the Sonny Gray trade, is headed to the Arizona Fall League and could end up with the highest ceiling of any pitching prospect in the organization. Baseball America says Clarke is the hardest thrower among pitchers in the 2026 Arizona Fall League, with a max velocity of 103.1 mph.
On a Baseball America podcast breaking down the AFL rosters, Geoff Pontes put Clarke in rare company, saying that "other than Jacob Misiorowski, there aren't many guys who are as electric for one inning or one at-bat as Clarke is."
That comparison is the one Cardinals fans will latch onto, and for good reason. Misiorowski is the most dynamic pitcher in baseball, armed with the third-fastest pitch in major league history.
But the appeal goes beyond the radar gun. He brings elite extension and spin rates, the kind of traits that make a pitcher look like a lab-built prototype.
Clarke, at least in that sense, is the closest thing St. Louis has to a Misiorowski-style arm.
There’s a bigger organizational shift wrapped up in that, too. The Cardinals and president of baseball operations Chaim Bloom are no longer leaning only on the old formula of soft-tossing, ground-ball types. With a revamped development staff, they’re taking swings on pitchers with more explosive stuff and more volatility, trusting they can help those arms hit the ceiling.
Clarke is already climbing the prospect ladder. MLB Pipeline has him at No. 9 in a Cardinals farm system that looks strong overall.
This season, he has posted a 3.34 ERA with 44 strikeouts in 29.2 innings across four minor league levels. His 5.2 walks per nine innings is still a number that needs work, even if it is a career best.
That’s where the caution comes in. The Misiorowski comparison makes sense on the surface, but it shouldn’t send expectations into overdrive.
Scouts once saw Misiorowski as a future reliever because he was basically a fastball-slider arm before signing with the Brewers, and his shaky control in the minors kept him in the wild-card category. Milwaukee changed the story by giving him a wipeout curveball and improving his command to above average in the majors.
Clarke’s path is not that clean. His fastball doesn’t show the same movement traits that have drawn people to Misiorowski, and his curveball isn’t in the same class either.
Just as important, there’s no guarantee St. Louis can bring Clarke’s control anywhere near major league average, let alone what Milwaukee has done with Misiorowski.
The Cardinals have had the benefit of durable starters in recent seasons, thanks in part to the careful handling of the rotation by Oli Marmol and Dusty Blake. But that came during a stretch when their pitchers generally weren’t matching the league’s velocity peaks.
As St. Louis catches up and starts developing harder throwers, injuries are likely to become more common, and the lower levels are already showing some of that strain.
Misiorowski has avoided Tommy John surgery so far, but any pitcher throwing this hard is living with real arm and shoulder risk. Clarke has already dealt with an aneurysm in his left shoulder.
If trouble hits again, there’s no promise his stuff comes back intact. And if Tommy John surgery ever enters the picture, some of that arm talent could be left behind on the operating table.
So yes, there’s plenty that can go wrong on Clarke’s road to St. Louis.
Betting on a neat, Misiorowski-like outcome would be foolish. But the Cardinals do have something special here, and if they develop him properly, the payoff could be huge.
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