Quinn Mathews Fantasy Stats

St. Louis Cardinals pitching prospect Quinn Mathews has been pitching well all season for Triple-A Memphis, but has really been making the case for a major league debut since late May. Over his last seven starts, the Cards' sixth-ranked prospect has pitched to a 2.23 ERA, 0.91 WHIP, and a 21.4 percent K-BB% with 46 strikeouts in 36 1/3 innings pitched. The southpaw's opponent batting average is just .178 on the year, but he has been prone to allowing home runs this season, with a gaudy 24.0 percent HR/FB%, and together with a 15.2 percent walk rate, it has likely factored into why he hasn't already made his debut in the majors. But with zero walks allowed in his last start, perhaps he's finally ready for the jump. The 25-year-old could be up by August, and with his strikeout potential, he could be a worthwhile stash option in deeper 12+ team leagues for managers looking for pitching help.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews is showing off his upside this season. In 15 starts at Triple-A Memphis, Mathews has a 4-3 record with a 3.95 ERA and 83 strikeouts in 66 innings pitched. Since serving up four runs on May 22, the southpaw has logged 30 1/3 innings to the tune of a sharp 2.08 ERA and a 0.89 WHIP. The high strikeout upside is the first thing that stands out and makes him extremely enticing as a fantasy starter. He has allowed 11 home runs, which is fairly high at this point in the season, but his overall numbers are very good. The fourth-round pick out of Stanford is eyeing a promotion to St. Louis and is looking for a spot in the rotation. Right now, the MLB rotation has five solid starters, so a call-up could depend on an injury. But Mathews has proven himself at the Triple-A level this season and could be an excellent addition in deep leagues as a wait-and-see target.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews has begun to turn the corner at Triple-A and is quickly emerging as a top prospect to stash among pitchers. Mathews turned in a dominant debut season in the St. Louis system in 2024 but has yet to return to that level of play. In 2025, he logged only 99 innings and saw those troubles linger early in 2026. Through his first 35 2/3 innings this season, the southpaw posted a hefty 5.55 ERA with a 1.63 WHIP. During this stint, Mathews posted a rough 44:30 K:BB. However, over his last 21 innings of work (four starts), the former Stanford standout has held a stellar 1.71 ERA with a much-improved 28:9 K:BB. While he may need to show this success over a longer stretch, he has a clear path to the majors given St. Louis' weak rotation. He is a viable target in the 12+ team leagues ahead of Week 13, but can quickly enter priority stash range if he turns in a strong conclusion to June.

St. Louis Cardinals pitching prospect Quinn Mathews has started to turn it on over his last two starts with Triple-A Memphis, allowing just four hits and two walks while striking out 15 across 12 scoreless innings. The 25-year-old's overall line for the season is less appealing, as he's pitched to a 4.01 ERA with a 15.8% walk rate across 51 2/3 innings (12 starts). Still, Mathews is considered to be one of the top pitching prospects in the Cardinals' system and could be proving that he's figured something out with his recent performance. With St. Louis in the thick of the National League playoff picture and searching for high-end starting pitching at the big-league level, it could be only a matter of time before Mathews is called up for his MLB debut. In deeper leagues, fantasy managers may want to consider stashing Mathews off the waiver wire.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews was reassigned to minor league camp earlier this week. The left-handed prospect was in consideration to break camp with the MLB roster, but given the time he missed last season due to a shoulder injury and inconsistent production, he was likely ticketed for Triple-A. At camp, Mathews struck out 12 hitters over seven innings but carried a 5.14 ERA with a 1.29 WHIP. Fantasy managers should monitor his progress at Triple-A early in the season as he could make a case for a first-half promotion. Before his struggles in 2025, Mathews was looking like a budding ace in 2024, when he logged 143 1/3 innings across the entire system with a 2.76 ERA, 0.98 WHIP, and a 202:49 K:BB. Given his strikeout upside, he could have sleeper appeal when he earns the call in deeper leagues.

St. Louis Cardinals left-handed pitching prospect Quinn Mathews was expected to contend for his MLB debut early in the 2025 season, but was unable to earn the call. The southpaw struggled at Triple-A last season, finishing the campaign holding a 3.93 ERA with a 1.60 WHIP across 94 innings. He struck out 107 batters but served up a high 74 walks. However, during his final 57 1/3 innings, Mathews was able to lower his ERA to 3.30, suggesting he made some progress in the second half. During the 2024 season, Mathews progressed through the St. Louis system at a rapid rate. He began the season by making his professional debut with Low-A and would finish the season at Triple-A. Across 143 1/3 total innings, the Stanford product posted a 2.76 ERA with a 0.98 WHIP. Given that the Cardinals lack proven options at the back of their rotation, Mathews could contend for an early MLB debut if he can rekindle his 2024 form.

St. Louis Cardinals pitching prospect Quinn Mathews tossed 5 1/3 shutout innings on Saturday, allowing two hits while walking four batters and striking out seven. Although his control has been poor at Triple-A (including 2024), the Cards' fifth-ranked prospect has pitched better in the second half of the season, owning a 2.28 ERA over his last nine starts with a 30.2 percent strikeout rate (11.84 K/9). The Cardinals, winners of three straight, are still in the mix for a Wild Card berth, sitting 5 1/2 games out from the final spot. With the command issues persisting from Mathews, St. Louis may not give him a shot in the majors unless one of the regular rotation arms goes down with an injury. Look for the 24-year-old to make a push for a rotation spot next spring, and while he could be a solid starter in the majors, his fantasy stock has taken a hit.

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.