Misiorowskis September Start Suddenly Carries Much Bigger Stakes

As Jacob Misiorowski prepares for another showdown against the Cubs, his historic season cements his status among baseball's elites.

Jacob Misiorowski heads into September with the kind of season that forces the record book to start making room.

The Brewers right-hander said he still feels the same edge he had on Opening Day, even after a stretch where his velocity dipped a bit. After his most recent outing against the Mets, he shrugged off the concern and pointed to the grind of the calendar.

“I feel just as sharp as I did on Opening Day,” Misiorowski said after his last start against the Mets, when asked about a recent dip in his velocity. “I think it’s just a part of it.

The body’s tired. Everyone’s tired.

It’s August going into September. It’s part of it.”

That attitude will matter again Wednesday, when Misiorowski takes the ball for his first start of September as the Brewers and Cubs keep rolling through their four-game set at Wrigley Field. He has a chance to beat Chicago for the third time this year and to keep building on a regular season that has already turned into something rare. Entering Tuesday, he led the Majors in ERA, strikeouts, WHIP and opponents’ batting average.

The Brewers also have to manage the workload carefully. They’re trying to lock up the National League Central, and they’re chasing one of the NL’s top two seeds that would give them a first-round bye in the postseason. Misiorowski has already logged 151 innings, topping his previous career high of 141 1/3 innings between Triple-A and the Majors in 2025, and that total includes his 12 playoff innings.

Even with that caution in mind, the numbers he’s putting up put him in striking distance of some elite company. Using 150 innings as the cutoff, his 0.76 WHIP is the second-best single-season mark on the list, behind only Pedro Martínez’s 0.74 in 2000 and ahead of Walter Johnson, Justin Verlander and Addie Joss.

Martínez, Johnson and Joss are in the Hall of Fame, and Verlander is headed there. The top 20 is crowded with familiar names like Greg Maddux, Ed Walsh, Christy Mathewson, Grover Cleveland Alexander, Zack Greinke, Bob Gibson, Sandy Koufax and Clayton Kershaw.

His 1.73 ERA also belongs in the conversation, even if the full historical database stretches the ranking deeper. According to Baseball-Reference, it’s 105th best among pitchers with at least 150 innings in a season. Dutch Leonard owns the all-time benchmark with a 0.96 ERA in 1914, while Bob Gibson’s 1.12 in 1968 stands as the best of the last century before MLB lowered the mound the following year.

If you start the comparison in 1969, Misiorowski’s season pops even more. Only Dwight Gooden, Greg Maddux, Zack Greinke, Jacob deGrom, Mark Eichhorn, Pedro Martínez, Ron Guidry and Justin Verlander have posted better ERAs with 150-plus innings since then, and several of those years came with a Cy Young Award.

The strikeout profile is just as eye-catching. Misiorowski’s 38.9% strikeout rate ranks behind only Gerrit Cole’s 39.9% from 2019 among the names listed here, and ahead of Chris Sale, Pedro Martínez and Randy Johnson.

Modern usage means he won’t get near Matt Kilroy’s all-time total of 513 strikeouts from 1886, or even Nolan Ryan’s 383 in 1973. But with 222 strikeouts, he does have a Brewers milestone in view: Ben Sheets’ franchise record of 264, which leaves Misiorowski 42 away.

How many chances he gets to chase that mark is still up in the air. The best guess is four or five more regular-season starts, depending on how the postseason race unfolds.

There’s more to the season than just ERA and strikeouts, too. Misiorowski’s adjusted ERA of 239 is 15th all-time and the best since Martínez’s 291 in 2000. Since the mound was lowered in 1969, only Maddux’s 271 and 260 from 1994 and 1995, along with Martínez’s 243 in 1999, have topped it.

And then there’s the contact he allows, or barely allows. His .242 opponents’ slugging percentage is fifth lowest all-time using the 150-inning standard. The gap between that number and league average tells the bigger story: Misiorowski has been an outlier in a season where hitters around the league are slugging .400.

“He knows he’s got a big fastball and has the ability to blow it by some guys,” said Brewers outfielder Jackson Chourio. “But he also has the ability to pitch and mix in the other pitches when the game is telling him to. It’s really just fascinating to be able to watch.”

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