Prospect fatigue can do funny things to a player’s reputation, and Quinn Mathews looks like the latest example. After he carved up minor league hitters in 2024, a rough 2025 stretch cooled a lot of the buzz. Even when he got back on track at Triple-A this season, the conversation around him never really caught up to the numbers.
That disconnect has carried into his first run in the majors. Mathews has opened his big league career with a 3.62 ERA over 37.1 innings across seven starts, but that number doesn’t tell the full story. Strip out the start against the Phillies, when he had to "wear it" to help their bullpen, and he’s sitting on a 2.77 ERA in 26 innings.
His first seven outings have looked like this:
5 IP | 2 R | 3 K
4 IP | 1 R | 7 K
5 IP | 7 R | 3 K
5.2 IP | 1 R | 7 K
5 IP | 1 R | 4 K
6 IP | 2 R | 4 K
6.2 IP | 1 R | 8 K (tonight)
He’s been excellent outside of one rough outing!
Mathews is scheduled to take the ball again today, and the case for his upside is pretty easy to make. Of the Cardinals’ current rotation options, he may have the highest ceiling. Even as other young arms arrive and make noise, Mathews has the kind of talent that can turn into a real difference-maker for years.
The Cardinals’ lineup feels more settled than their pitching staff, which is still very much a work in progress. There are arms in the mix, sure, but not many you can confidently pencil in as core pieces going forward.
Mathews brings the kind of strikeout ability the Cardinals have been missing from the rotation in recent seasons. That hasn’t fully translated yet in the majors - his strikeout rate is 22.2 K% so far - but the signs are there.
In three of his seven starts, he’s punched out more hitters than he’s allowed innings. As he gets more comfortable, those swing-and-miss numbers should start looking more like the ones he posted in the minors.
The walks are still part of the package, but the broader profile is encouraging. Mathews looks capable of giving St.
Louis six or more innings on a regular basis while missing enough bats to keep lineups from getting too comfortable. His slider and changeup have been his best offerings, and both have the kind of bite that can generate plenty of whiffs.
He’s been treated like a back-end starter by some, and that might end up being his statistical lane. But the talent suggests more than that.
Mathews has a chance to be a strong No. 3 starter, and maybe even a No. 2.
Cardinals fans know how rare that kind of pitcher is.
That’s why it’s strange that he hasn’t gotten more attention. Other young players have deserved their share of the spotlight, but Mathews has sometimes been overlooked despite producing real results. The Cardinals need more high-end pitching as they move forward, and he looks like a piece worth taking seriously.
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