3 Impact Fantasy Baseball Prospects To Stash - Quinn Mathews, Hunter Barco, Logan Henderson

Three top fantasy baseball prospects - Quinn Mathews, Hunter Barco, Logan Henderson - that can make big impacts. These MLB prospects are waiver wire pickups or stashes.

Through the opening months of the season, fantasy managers have seen several pitching prospects make an immediate impact in the major leagues. Jacob Misiorowski of Milwaukee and Kansas City's Noah Cameron are just a few of the budding arms in the game.

In this piece, we will examine three top pitching prospects currently at Triple-A and determine whether they are worth stashing.

Should those players be left on the waiver wire, or should fantasy managers add them before their breakout? Let's dive in!

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Quinn Mathews, SP, St. Louis Cardinals

Current Level: AAA
Availability: 5% rostered
2025 AAA stats: 32 IP, 4.50 ERA, 1.88 WHIP, 32 SO, 33 BB

The left-hander appeared on the fast track to make his MLB debut since returning from the IL, but had a brief setback this week. On June 24, Mathews allowed two hits, six walks, and five runs through just 1 1/3 innings of work. Then on June 29, Mathews continued to slump, allowing three walks across 4 2/3 innings of work.

Prior to this disappointing outing, Mathews looked quite strong since returning from his shoulder injury. Over his first 18 2/3 innings at Triple-A after his injury, Mathews held a solid 2.89 ERA with a 1.34 WHIP. During this stretch, the 24-year-old struck out 25 batters and allowed 13 walks.

Last season, the No. 40-ranked prospect (according to MLB.com) progressed through the St. Louis system at a remarkable pace and was even in play to reach the majors late in the campaign. The Stanford product began the campaign with Low-A and was able to conclude the season with Triple-A. Through 126 2/3 innings with Low-A, High-A, and Double-A, the southpaw posted an elite 2.27 ERA with 0.85 WHIP.

He showed near-perfect command, allowing only 35 walks while striking out 180 batters. However, in his first look at Triple-A, Mathrwews took a step back, allowing 12 runs in 16 2/3 innings.

If the left-hander can continue to progress at Triple-A, he should be in the mix to join the Cardinals shortly after the All-Star break. If they remain in the Wild Card race, he will have a path to remain in the majors during the stretch run.

For now, the left-hander is worth stashing in all 12+ team formats. If he can continue to improve his control at Triple-A, he could possess solid upside when given the call to the majors.

LHP Quinn Mathews (AAA) was nearly unhittable this afternoon, tossing 5.0 scoreless innings while allowing one base hit (single) and punching out 6.

Since being activated for the IL on May 31, the southpaw is 2-0 with a 2.30 ERA in 4 starts. pic.twitter.com/nxsjO4QPC7

— Cardinals Player Development (@CardsPlayerDev) June 18, 2025

-Written by Andy Smith

Hunter Barco, SP, Pittsburgh Pirates

Current Level: AAA
Availability: 5% rostered
2025 AAA stats: 31 2/3 IP, 3.69 ERA, 1.33 WHIP, 40 SO, 18 BB

Honestly, it wouldn't surprise me to see Hunter Barco get the call before Chandler at this point. Barco has had a phenomenal season so far in 14 starts between Double-A and Triple-A, recording an impressive 2.04 ERA, 1.05 WHIP, and a 21.2% K-BB rate. The walk rate is a bit high at 10.8%, but that's manageable given Barco's ability to miss bats at a high clip.

He currently has a 32% strikeout rate and a 13.9% SwStr rate this season.

Before reaching Triple-A, Barco logged 25 2/3-striaght shutout innings at Double-A. During this impressive stint, the left-hander struck out 34 batters while posting a near-perfect 0.70 WHIP.

Hunter Barco had himself an afternoon. 🔥

5.2 no-hit innings
7 strikeouts pic.twitter.com/u79U7dm7FU

— Indianapolis Indians (@indyindians) June 29, 2025

Barco works with a four-pitch mix and features three above-average offerings in his mid-90s fastball, low to mid-80s slider, and a mid-80s splitter. He's shown the ability to miss bats with all three offerings, and has the upside of a No. 3 starter long-term. Nobody is pitching poorly enough to warrant a bump out of Pittsburgh's current rotation, but Barco could be the next man up when the need for a starter arises.

If Barco continues to find his footing at Triple-A, he could be in the mix to earn a promotion shortly after the All-Star break.

- Written by Eric Cross

Logan Henderson, SP, Milwaukee Brewers

Current Level: AAA
Availability: 5% rostered
2025 MLB stats: 21 IP, 1.91 ERA, 0.95 WHIP, 29 SO, 6 BB

The final player we will look at in this piece is Milwaukee's Logan Henderson. While Henderson has already had a look at the majors, unlike the other players on this list, he may have the most challenging path to return. The Brewers recently promoted fellow pitching prospect Jacob Misiorowski, who has been nothing short of dominant during his first taste of the major leagues.

The hard-throwing right-hander appears to be locked into a rotation spot for the foreseeable future, which could limit Henderson's fantasy ceiling for the remainder of the campaign.

However, Henderson was also quite comfortable during his first taste of the big leagues and could eventually push their hand. During his first four starts in the big leagues, Henderson struck out 29 batters through 21 innings while posting a 1.91 ERA. He allowed only six free passes.

Since returning to Triple-A, Henderson has been just as effective. Since June 1 (23 2/3 innings), the right-hander has posted a strong 2.66 ERA with a 1.31 WHIP. During this stretch, the 23-year-old has struck out 25 hitters while allowing only eight walks.

While the Brewers likely sent him back to Nashville to mentor his innings, if the Brewers remain in the Wild Card race, they will likely give Henderson the call in the second half. Currently in their rotation, the Brewres do not have a clear opening, but Henderson would likely be the first name called as an injury replacement.

Without a definitive path to the major leagues, Henderson is only worth stashing in deeper 12+ team formats for the time being, despite his impressive success during his earlier stint in the bigs.

Logan Henderson over the last month+ appears to be pushing hard to develop a more rounded arsenal. The slider usage is ticking up and has actually performed far better than the cutter. The results have been effective with a tight shape, while the cutter seems more inconsistent pic.twitter.com/fTew3HrOYd

— Jake McKibbin (@thebrewerblogs) June 26, 2025

- Written by Andy Smith

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