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Marty's fantasy baseball prospect stashes, sleepers, and rookie waiver wire pickups for Week 12 of 2026 -- recent MLB prospect debuts and potential call-ups to monitor.
Fantasy Baseball Hitter Prospects To Target
Blaze Jordan, 1B/3B, St. Louis Cardinals (17% rostered)
Level: MLB
2026 Stats: 252 PA, .313/.373/.548, 37 R, 11 HR, 35 RBI, 2 SB, 7.5% BB%, 11.5% K%, 137 wRC+
The St. Louis Cardinals recently called up their No. 26 prospect, infielder Blaze Jordan. Originally drafted by the Red Sox, Jordan was traded to St. Louis in July 2025 as part of the Steven Matz deal.
He brings plus raw power while demonstrating above-average contact skills for a slugger.
In just his third major league game, Jordan launched a three-run homer against the Minnesota Twins.
BLAZE JORDAN FIRST MLB HR! pic.twitter.com/NofLpdZ1kn
— St. Louis Cardinals (@Cardinals) June 13, 2026
Scouts have long praised his ability to control his barrel through the zone while also being able to make in-game adjustments.
Those traits have translated into a 82.3% contact rate, a 11.5% strikeout rate, and a 7.5% walk rate across 252 Triple-A plate appearances this season.
Defensively, there isn't much to get excited about. While he's currently starting at third base for the Cardinals, first base is likely his long-term home.
He also possesses well below-average speed, so don't expect more than five steals over a full season. With that said, the bat looks to be major league-ready, but how much playing time will he actually get?
Since being called up, Jordan has appeared in five straight games. He has started four times at third base and once at first base, so it looks like the Cardinals are finding every way to get him into the lineup.
Looking at the roster, he doesn't have much competition either, especially after Nolan Arenado was traded to the Arizona Diamondbacks this offseason and Nolan Gorman was just demoted to Triple-A Memphis last week.
Overall, Cardinals third basemen have combined for a 67 wRC+ this season, which is tied with the Milwaukee Brewers for the third-worst mark in baseball.
For fantasy purposes, it's hard to ask for much more. Jordan appears locked into everyday playing time, and his power should play well alongside his contact skills and plate discipline. He should be rostered in all 12-team leagues.
Cooper Pratt, SS, Milwaukee Brewers (5% rostered)
Level: MLB
2026 Stats: 261 PA, .241/.349/.386, 34 R, 6 HR, 32 RBI, 17 SB, 13.4% BB%, 14.6% K%, 100 wRC+
On Tuesday night, shortstop Cooper Pratt got his first taste of the majors. Although he is only 21 years old, the promotion wasn't a total surprise because he just inked an eight-year, $50.75 million contract extension with the Brewers back in April.
For fantasy managers, that's exactly the kind of commitment you want to see. When an organization invests that much in a young player, it's usually a sign that he'll be given every opportunity to succeed, which means more playing time.
Pratt ranks as the Brewers' No. 10 prospect and offers a solid mix of contact skills and speed. Although the power hasn't fully arrived yet, Pratt has consistently shown the ability to make consistent contact and control the strike zone.
Here is a look at his Triple-A Statcast page.
If the power keeps coming along, Pratt could eventually settle in around 15 home runs with 30+ stolen bases over a full season.
That said, expecting that kind of production this year is probably too optimistic, especially after he posted just a 100 wRC+ at Triple-A this season. But he should have plenty of time to figure it out because of his Gold Glove-caliber defense.
Did someone say Brewers Gold Glover? 🏆
Cooper Pratt takes home the Rawlings @MiLB Gold Glove as the best defensive SS in the minors #ThisIsMyCrew pic.twitter.com/QMEFUZtnpn
— Brewers Player Development (@BrewersPD) November 4, 2024
Also, luckily for him, there really isn't anyone who could replace him. Remember when we talked about how bad the Brewers' third-base situation has been? Their shortstop production hasn't been much better.
Milwaukee shortstops have posted a 74 wRC+, the eighth-worst mark in baseball. Simply put, the combination of David Hamilton and Joey Ortiz hasn't provided enough offense, so a change was necessary.
For fantasy managers, Pratt looks like a .240 hitter with a bit of pop and up to 20 steals if he sticks in the majors the rest of the way.
The good news is the Brewers are tied for the third-most steals in baseball, so he’s stepping into an offense that frequently runs.
Overall, Pratt has enough of a floor to be rostered in 12-team leagues. At worst, he profiles as a usable middle-infield option, with a little upside if everything comes together.
Kyler Fedko, OF, Minnesota Twins (0% rostered)
Level: MLB
2026 Stats: 239 PA, .286/.372/.578, 44 R, 15 HR, 45 RBI, 9 SB, 10.9% BB%, 22.2% K%, 138 wRC+
The Twins have called up Kyler Fedko, their No. 17 prospect. While the 26-year-old outfielder isn't a household name in prospect circles, he forced his way into the conversation last season with 28 homers, 38 steals, and a 130 wRC+ across Double-A and Triple-A.
He’s also kept it going this year at Triple-A, slashing .286/.372/.578 with 15 homers over 58 games.
It's now a two homer game for @KylerFedko4. His team is tied 13th in the season. It's the third multi-homer game for Fedko this season. He has nine extra-base hits over his last 14 games and 14 RBI in his last 14 pic.twitter.com/QyOGITWGee
— St. Paul Saints (@StPaulSaints) June 6, 2026
At the plate, Fedko brings a solid mix of power and speed, but there’s some swing-and-miss in the profile. He can get a little too aggressive at times, which has contributed to a nearly 13% swinging-strike rate.
If that trend follows him to the majors, batting average could become an issue. Even so, Fedko has the kind of fantasy-friendly skill set that should be useful if he draws enough playing time.
However, unlike Jordan and Pratt, Fedko doesn’t have a clear path to everyday at-bats right away. With a crowded roster, the right-handed hitter will likely start in a short-side platoon role, spelling lefties like Trevor Larnach and Kody Clemens.
That said, if he gets hot, or if an injury pops up (and with Byron Buxton, that’s never off the table), things could change in a hurry.
For fantasy, he’s worth a flyer in 15-team, five-outfielder leagues, but playing time will be the thing to watch early.
Fantasy Baseball Pitcher Prospects To Target
Quinn Mathews, SP, St. Louis Cardinals (2% rostered)
Level: Triple-A
2026 Stats: 53 IP, 1.19 ERA, 0.98 WHIP, 35.0% K%, 9.9% BB%, 3.12 FIP
After a slow start to the Triple-A season, Quinn Mathews has turned things around in a big way. Over his last 16 innings, the left-hander has allowed just one earned run while racking up 23 strikeouts to only five walks.
The 25-year-old is the Cardinals' No. 3 pitching prospect and currently the highest-ranked pitching prospect at the Triple-A level. For fantasy, Mathews offers durability and an MLB-ready arsenal.
On the mound, he attacks hitters with a five-pitch mix that relies on sequencing and deception rather than overpowering velocity. Here’s a breakdown of his pitches over the years.
While his fastball sits in the 93-96 mph range, it plays up because of his secondary pitches. His best secondary pitch is his changeup. Sitting 82–84 mph, it plays off the fastball well and consistently disrupts hitters’ timing.
He also mixes in a mid-80s gyro/cutter slider that generates plenty of whiffs and serves as his main put-away pitch against lefties. A usable curveball and sinker round out the arsenal, giving hitters a few different looks.
Mathews doesn’t have overpowering stuff, but his pitch mix, command, and feel for sequencing give him legitimate SP4 upside down the road. The key question is timing: when will he receive the call?
Right now, there isn't an opening in the Cardinals’ rotation, but if they’re serious about staying in the Wild Card race, they may eventually have to move on from Kyle Leahy.
Leahy has a 4.56 SIERA with a 9.3% K-BB% over 64 innings this season, and the underlying numbers don’t help much either. He's posted a 89 Stuff+ and 98 Pitching+. Because of that, Mathews could find himself in St. Louis sooner rather than later.
When he gets the call, he’s more of a 15-team streaming option at first, just until you can trust him.
More Fantasy Baseball Prospects and Rookies
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