MLB Prospect Debuts: Fantasy Baseball Waiver Wire Pickups and Rookie Stashes (Week 3)

April 17, 2026

Marty's fantasy baseball prospect stashes, sleepers, and rookie waiver wire pickups for Week 3 of 2026 -- recent MLB prospect debuts and potential call-ups to monitor.

The first wave of prospects has settled in, and now it’s time to start looking ahead to the next group. This week, we’re focusing on two players who could provide an immediate boost to your fantasy roster, and two others who may not arrive until later in the summer.

As we discussed last week, the upcoming key windows for prospect call-ups are April 10–20 and early to mid-June. Over the next few weeks, you should expect to see a handful of promotions across MLB. For fantasy managers in 2026, it’s crucial to track prospect performance throughout the minors, especially with injuries creating sudden opportunities for call-ups.

Each player featured here is rostered in fewer than 60% of Yahoo! leagues. If you have any questions or want me to cover a specific player, feel free to reach out on X @Marty_Tallman. Now, let’s get started!

Fantasy Baseball Hitter Prospects To Target

Colt Emerson, SS, Seattle Mariners (12% rostered)

Level: Triple-A

2026 Stats: 54 PA, .265/.321/.408, 5 R, 1 HR, 5 RBI, 2 SB, 3.7 BB%, 31.5K%, 92 wRC+

Colt Emerson is the No. 1 prospect in the Seattle Mariners organization, and the two parties recently agreed to an eight-year, $95 million contract extension. The Mariners' President of Baseball Operations, Jerry Dipoto, just said he expects Emerson to join the big league club very soon. 

How far away is Colt Emerson from the Big Leagues?

Mariners POBO Jerry Dipoto: "He's as close as they come..."

MLB Network + @SageUSAmerica pic.twitter.com/0xi4SeaZ2w

— MLB Now (@MLBNow) April 13, 2026

The lefty-hitting Emerson offers the upside of a plus hit tool and power, with the ability to play shortstop or third base. Across Double-A and Triple-A in 2025, the 20-year-old slashed .285/.383/.458 with 16 home runs and 14 stolen bases.

He also displayed encouraging plate discipline, striking out just 17.5% of the time while walking at an 11.8% rate over 600 plate appearances. So far in Triple-A, Emerson’s only real concern is his inflated 31.5% strikeout rate. However, Emerson has consistently improved at each level as he settles in, so there’s little cause for concern.

In 2025, he struck out 22.2% of the time across 27 Triple-A plate appearances. Once called up, ATC projects him for just five home runs and five stolen bases, but that’s in only 284 plate appearances. If he earns a call-up by May, he could realistically double that production. But do the Mariners actually need him right now? As a team, Seattle sits around a 96 wRC+, yet Emerson’s direct competition has been far more productive offensively.

Infielders J.P. Crawford, Cole Young, and Brendan Donovan all own a wRC+ of 120 or better. That said, even without a clear opening, the organization seems determined to put Emerson into the lineup sooner rather than later. For fantasy, Emerson will be most valuable in 15-team leagues as a middle infielder with upside. This may be your last chance to stash him before he packs his bags for Seattle.

Max Clark OF, Detroit Tigers (7% rostered)

Level: Triple-A

2026 Stats: 66 PA, .352/.439/.537, 12 R, 0 HR, 7  RBI, 6 SB, 15.2 BB%, 7.6 K%, 165 wRC+

Max Clark is a 21-year-old outfielder and the Detroit  Tigers’ No. 2 prospect behind Kevin McGonigle. Clark projects to eventually be a five-tool fantasy asset, and he is already finding success at  Triple-A this season.

Max Clark’s first ten AAA games:

.421 AVG, 7 2B, 5 RBI, 5 SB, 8 BB#Tigers pic.twitter.com/6BLfvhcXRN

— Milb Central (@milb_central) April 9, 2026

The Tigers are down an outfielder after Parker Meadows collided with Riley Greene over the weekend. Although Greene avoided serious injury, Meadows suffered a fractured arm and a concussion and has been placed on the 60-day injured list.

Unsurprisingly, switch-hitting Wenceel Perez got the call-up from Triple-A over Clark to help fill the void left by Meadows. However, if Pérez struggles as he did at times last season, it’s possible the left-handed hitting Clark could arrive earlier in the summer than initially anticipated. So far, Pérez is hitless across his first seven plate appearances.

Unfortunately, A.J. Hinch has already stated that Clark still needs additional development time, and there are no immediate plans to promote him. So, when should we expect Clark to join the big league squad? Optimistically, a post–April 20 call-up remains possible, as that’s the point when the Tigers would secure an extra year of team control. There is also a good chance that we don't see him until around the All-Star break.

Either way, Clark is dominating Triple-A, and soon he won't have anything else to prove in the high minors. Although he hasn't fully developed his power, his other four tools make him a fantasy asset worth monitoring this season. He should be stashed in 15-team, five outfielder leagues.

Fantasy Baseball Pitcher Prospects To Target

Noah Schultz, SP, Chicago White Sox (47% rostered)

Level: MLB

2026 Stats: 14 IP, 1.29 ERA, 0.43  WHIP, 40.4 K%, 4.3 BB%, 2.04 FIP

Noah Schultz, the No. 2 prospect in the Chicago White Sox organization, just made his MLB debut against the Tampa Bay Rays.

Noah Schultz made his MLB debut!

The towering lefty fired off 4.1 IP with 3 ER, 3 H, 4 K, and 4 BB. His stuff looked great, however, Rays batters did not bite on his secondaries. This caused him to struggle to generate whiffs, leading to the handful of walks pic.twitter.com/CAvfYrsUlg

— Thomas Nestico (@TJStats) April 15, 2026

Unfortunately for him, the Rays strike out just 18.4% of the time against left-handed pitching, which is the fifth-lowest rate in MLB. So, overall, it was a tough matchup, and he struggled. Still, he managed to post an impressive 55.6% whiff rate on his 97 mph four-seam fastball, while his cutter, sweeper, and sinker all graded out well.

If Schultz can find more consistent control, he has the raw stuff to develop into an elite fantasy pitcher.

The 6-foot-10 lefty is one of the tallest pitchers in baseball, and he pairs that size with a low three-quarter, almost sidearm slot, which is an extremely rare combination that adds to his deception. In 2025, Schultz dealt with patellar tendinitis in his right knee, which clearly impacted his performance. Across Double-A and Triple-A, he posted a 4.68 ERA and 1.67 WHIP while walking 13.8% of batters.

Now healthy, he is dominating Triple-A with a 36.2 K-BB% and a 16.5% swinging-strike rate. ATC projects Schultz for a 4.61 ERA with an 18.4% strikeout rate, while OOPSY (which incorporates Stuff+) is more optimistic, projecting a 4.05 ERA with a 22.2% strikeout rate. Schultz is rosterable in 12-team leagues until further notice because of his strikeout upside.

You’ll likely want to sit him for his next start in Oakland, but after that, the schedule becomes more favorable: a home matchup against the Washington Nationals, followed by road starts against the San Diego Padres and the Los Angeles Angels.

JR Ritchie, SP, Atlanta Braves (2% rostered)

Level: Triple-A

2026 Stats: 21.1 IP, 1.27 ERA, 1.03WHIP, 23.8 K%, 11.9 BB%, 3.96 FIP

Despite some inflated underlying metrics, JR Ritchie is rapidly climbing prospect rankings because of his advanced feel for reading hitters and sequencing pitches. The 22-year-old pairs that with solid command and a deep pitch mix, and he’s finally healthy again. After recovering from Tommy John surgery in 2023, he threw just 49 2/3 innings in 2024, but returned to full strength in 2025 and delivered an impressive season.

Across High-A, Double-A, and Triple-A, the right-hander posted a 2.64 ERA, 1.01 WHIP, 140 strikeouts, and 54 walks over 140 innings, along with a strong 49.6% groundball rate. He also held opponents to a .169 batting average. At Triple-A Gwinnett this season, Ritchie has posted a 10% swinging-strike rate, and here is a look at his most recent start against the Nashville Sounds.

JR Ritchie's hot start for Triple-A @GoStripers went up a level as he struck out 5 across 5 2/3 scoreless innings.

Could MLB's No. 83 prospect be closing in on his big league debut for the @Braves soon?

🗞️: https://t.co/lUYCx83WIK pic.twitter.com/IL9F5mc8yJ

— MLB Pipeline (@MLBPipeline) April 12, 2026

Despite his success, scouts still have valid concerns about his strikeout upside, as he doesn’t yet have a true elite put-away pitch. While that shouldn’t stop you from picking him up, it should temper expectations for high strikeout totals right out of the gate. So, when should we expect him in Atlanta? Given the Braves’ track record with developing and promoting pitching, it could be sooner rather than later.

Grant Holmes and Reynaldo Lopez have both had durability concerns, while Bryce Elder is coming off a 2025 season in which he posted a 5.30 ERA and 1.39 WHIP across 156 1/3 innings. With Didier Fuentes still building up his arm for a starter's workload and Spencer Strider (oblique) beginning a minor-league rehab assignment on April 16, Ritchie could push for an MLB debut by late May.

If the Braves’ starting rotation struggles to stay healthy or if Strider looks rusty upon return, Ritchie becomes a name to monitor closely. In 15-team leagues, he’s worth keeping on your radar, and once he’s eventually called up, he’ll likely be best utilized as a matchup-based streamer. Overall, Ritchie profiles as a solid, innings-eating starter with a relatively high floor but a more modest fantasy ceiling for 2026.

More Fantasy Baseball Prospects and Rookies