Quinn Mathews

24-Year-Old PitcherP
St. Louis Cardinals AAA
2025 Fantasy Outlook
Mathews was a workhorse at Stanford, but he only averaged 91.6 mph with his fastball as a junior and was selected by the Cardinals in the fourth round of the 2023 draft. He showed up in 2024 sitting in the mid-90s (touching 98 mph) with above-average ride on that pitch and was arguably the top breakout pitching prospect of the year. The 6-foot-5 lefty logged a 2.76 ERA, 0.98 WHIP and a 202:49 K:BB in 143.1 innings across 26 starts, beginning the year at Single-A and finishing the year at Triple-A. In addition to his massively improved fastball, Mathews boasts a borderline plus-plus changeup and a comfortably above-average slider. He struggled in a small sample at Triple-A, with two five-walk starts bringing down his numbers at that level as he adjusted to the balls and strikes challenge system. Even so, he should be given every opportunity to win a spot in the big-league rotation this spring, and he will spend the bulk of his age-24 season in the majors, barring injury or a significant skills decline. Read Past Outlooks
RANKS
Rest of Season
From Preseason
#397
ADP
Signed a $600,000 contract with the Cardinals in July of 2023.
Turning things around at Triple-A
PSt. Louis Cardinals  AAA
August 19, 2025
Mathews has a 2.70 ERA, 1.08 WHIP and 25:5 K:BB in 16.2 innings over his last three starts for Triple-A Memphis.
Analysis
Mathews has failed to meet expectations this season, logging an 18 percent walk rate and 1.65 WHIP in 65 innings at Triple-A with an early-season shoulder injury mixed in. However, this most recent stretch is his best of the season, so it would at least seem that he is healthy and making progress with his shoddy control.
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Pitching Stats
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Minor League Game Log
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Minor League Left/Right Pitching Splits (AAA)
Since 2023
 
 
-4%
BAA vs RHP
2025
 
 
-8%
BAA vs LHP
2024
 
 
-34%
BAA vs RHP
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .242 118 24 22 23 6 0 1
Since 2023vs Right .233 275 82 46 52 10 0 5
2025vs Left .211 93 21 16 16 2 0 1
2025vs Right .230 221 63 38 41 7 0 4
2024vs Left .368 25 3 6 7 4 0 0
2024vs Right .244 54 19 8 11 3 0 1
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
Prospect Rankings History
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Defensive Stats
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Stats Vs Today's Lineup
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Recent RotoWire Articles Featuring Quinn Mathews See More
Recent RotoWire Articles Featuring Quinn Mathews See More
More Fantasy News
Activated from Triple-A IL
PSt. Louis Cardinals  AAA
June 2, 2025
Mathews (shoulder) was activated from Triple-A Memphis' 7-day injured list Saturday.
Analysis
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Starting rehab assignment
PSt. Louis Cardinals  AAA
Shoulder
May 19, 2025
Mathews (shoulder) was sent to the rookie-level Florida Complex League Cardinals to begin a rehab assignment Monday.
Analysis
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Ready to return
PSt. Louis Cardinals  AAA
Shoulder
May 13, 2025
Mathews (shoulder) will make a rehab start this week in the rookie-level Florida Complex League, Derrick Goold of the St. Louis Post-Dispatch reports.
Analysis
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Set to resume throwing
PSt. Louis Cardinals  AAA
Shoulder
April 23, 2025
Mathews (shoulder) will resume a throwing program Wednesday or Thursday, John Denton of MLB.com reports.
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On Triple-A IL with sore shoulder
PSt. Louis Cardinals  AAA
Shoulder
April 14, 2025
Cardinals president of baseball operations John Mozeliak said that Mathews was placed on the 7-day injured list at Triple-A Memphis on Sunday due to left shoulder soreness, Daniel Guerrero of the St. Louis Post-Dispatch reports.
Analysis
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