St. Louis Cardinals left-handed pitching prospect Quinn Mathews allowed three runs on six hits and three walks while striking out seven over three innings on Wednesday against Triple-A Charlotte. Mathews was able to rack up seven strikeouts with 14 whiffs on 31 swings but was inconsistent with his control, as he threw just 42 of 79 pitches for strikes. The lefty has had at least three walks in 11 of 18 starts this season. For the season, the 24-year-old owns a respectable 3.88 ERA but a bloated 1.65 WHIP in 65 innings at Triple-A. He'll need to harness his strike-throwing for him to be in any consideration for a starting role in the future.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews allowed only two hits and a walk while striking out nine across seven scoreless frames on Thursday against Triple-A Durham. This dominant outing was the lefty's longest start of the season, and he matched his season high for strikeouts. He generated 21 whiffs on 50 swings, with his changeup doing a lot of heavy lifting, accounting for 13 of them. Mathews doesn't throw very hard, and the walks have been an issue for him this year. His command will be an area to monitor as he progresses. It's been a mixed season overall for the 24-year-old, holding a 3.63 ERA, 1.58 WHIP, and a 72:50 K:BB ratio in 62 innings at Triple-A.

St. Louis Cardinals pitching prospect Quinn Mathews allowed one hit and two walks over five scoreless innings as he picked up the win against Triple-A Norfolk. Mathews was efficient in this outing, needing only 72 pitches. He generated 13 swings and misses on 31 swings for an excellent 42 percent whiff rate. The left-hander has been good through three starts in June, holding a 1.38 ERA, 1.08 WHIP, and 17:6 K:BB in 13 innings. His WHIP for the season still sits at a poor 1.55 as he's dealt with inconsistent control. He has walked at least three batters in five of nine starts this season. Mathews is trending in the right direction and should see time at the major-league level at some point this summer. His strikeout upside isn't huge, though, which limits his fantasy relevance to deeper formats.

St. Louis Cardinals pitching prospect Quinn Mathews (shoulder) began a rehab assignment with the team's Florida Complex League affiliate on Monday. The southpaw threw two scoreless innings, allowing one hit and no walks while striking out four in the outing. It's not clear how many starts the 24-year-old will make at that level, but an eventual return to Triple-A Memphis will take place once the rehab is complete. The 6-foot-5 hurler posted a 2.76 ERA, 0.98 WHIP, and a 26.8 percent K-BB% in 26 starts across various levels of the minors last year, recording 202 strikeouts in 143 1/3 IP and earning Minor League Pitcher of the Year honors. The Cardinals' second-ranked prospect should push for a call-up to the big leagues later this year, assuming command and velocity are intact upon his return to Memphis, which were some catalysts for his IL stint in the first place. The closer it looks to a debut, the lefty will become one of the higher priority prospect stashes.

St. Louis Cardinals pitching prospect Quinn Mathews (shoulder) is set to begin a throwing program on Wednesday or Thursday. Mathews was placed on the 7-day injured list with shoulder soreness. However, it appears this injury is not overly serious, and the top pitching prospect is already set to begin building back up. After an impressive 2024 campaign, Mathews took a step back through the early part of 2025 before his injury. Across his first 10 1/3 innings at Triple-A Springfield, the southpaw posted a 6.10 ERA with a 2.52 WHIP. He tallied just seven punchouts and served up 15 walks. However, last summer, across 143 1/3 innings split between Low-A, High-A, Double-A, and Triple-A, the No.2-ranked prospect in the system held a 2.76 ERA with a stellar 0.98 WHIP. If he can return to the mound soon, he should still be in the mix to make his MLB debut later this summer.

St. Louis Cardinals pitching prospect Quinn Mathews (undisclosed) was placed on the 7-day injured list on Monday afternoon. The team did not provide a reason why the budding southpaw hit the injured list. Fantasy managers should continue to monitor his status. Last summer, Mathews enjoyed an impressive campaign in the minor leagues as he began the season with Low-A and was able to finish the campaign with Triple-A. Across 126 1/3 innings in Low-A through Double-A, Mathews held a stellar 2.27 ERA with a 0.85 WHIP. During his first look at Triple-A, he allowed 12 runs across 16 innings. During the start of the 2025 campaign, Mathews showed similar struggles at Triple-A, posting a 6.10 ERA with a 2.57 WHIP across 10 1/3 innings. This injury will likely keep Mathews in the minor leagues through most of the first half of the campaign.