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.
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
After missing more than a month of action with left shoulder inflammation, Mathews tossed five scoreless innings with an 8:0 K:BB in two rehab outings before being activated. His first outing back in the Memphis rotation didn't go as well, as he yielded two runs with a 3:3 K:BB over 2.2 frames Saturday. The southpaw has permitted nine runs with a 10:18 K:BB in 13 innings covering four starts with Memphis this season, so he'll be looking to get back on track in June now that he has hopefully put his shoulder issue behind him.
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Pitching Stats
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Minor League Left/Right Pitching Splits (AAA)
Since 2023
 
 
-19%
BAA vs RHP
2025
 
 
-13%
BAA vs LHP
2024
 
 
-34%
BAA vs RHP
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .323 42 5 11 10 4 0 0
Since 2023vs Right .263 104 27 21 21 5 0 3
2025vs Left .250 17 2 5 3 0 0 0
2025vs Right .286 50 8 13 10 2 0 2
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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More Fantasy News
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.
ANALYSIS
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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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Goes on 7-day IL at Triple-A
PSt. Louis Cardinals  AAA
Undisclosed
April 14, 2025
Triple-A Memphis placed Mathews on the 7-day injured list Sunday due to an undisclosed injury.
ANALYSIS
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