MLB Prospect Debuts: Fantasy Baseball Waiver Wire Pickups and Rookie Stashes (Week 4)

April 23, 2026

Marty's fantasy baseball prospect stashes, sleepers, and rookie waiver wire pickups for Week 4 of 2026 -- recent MLB prospect debuts and potential call-ups to monitor.

Another week, another wave of top prospects to highlight for redraft leagues. This week, we’re hopping on the bus and heading to Triple-A to find the best stashable, soon-to-be rookies. As the April prospect window closes, it’s possible we won’t see as many call-ups until late May or early June. That said, teams are increasingly willing to promote players when the big league club is struggling with injuries or underperformance, so anything is possible.

For fantasy purposes, it’s important to continue tracking the progress of up-and-coming prospects so you’re ready when opportunities arise. As the season progresses, larger sample sizes give teams more leverage to bench or demote underperforming players. When that happens, you’ll want to be ready to take advantage. As always, 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 hop on the bus and head down to the farm!

Fantasy Baseball Hitter Prospects To Target

Ryan Waldschmidt, OF, Arizona Diamondbacks (4% rostered)

Level: Triple-A

2026 Stats: 97 PA, .338/.448/.563, 19 R, 2 HR, 14 RBI, 4 SB, 12.4 BB%, 25.8 K%, 154 wRC+

On our first stop, we visit the deserts of Nevada, where speedster Ryan Waldschmidt has come out of the gate hot and is building off his 2025 breakout campaign. Between High-A and Double-A last season, the 23-year-old slashed  .289/.419/.473 with 18 home runs and 29 stolen bases over 134 games. What really made that performance stand out, though, was his approach.

He struck out just 17.6% of the time while walking at an elite 16.0% clip. That same approach has carried over to Triple-A with the Reno Aces in 2026.

Another aspect of his game is his power. Even though he's only hit a couple of home runs so far, he has posted a 9.6% barrel rate and a 110.1 mph max exit velocity.  Here is a breakdown of his Triple-A performance from a Statcast perspective.

Even though the Diamondbacks’ outfield isn’t wide open, there are cracks. Corbin Carroll is obviously locked into an everyday role, but Lourdes Gurriel Jr. is returning from a knee injury, so he may not play every day. Also, with Jordan Lawlar sidelined by a fractured wrist, the final outfield spot is up for grabs. So far, Jorge Barrosa, Alek Thomas, and Tim Tawa have been filling in, but they are not the long-term answer.

Barrosa holds a 65 wRC+ while Thomas and Tawa both have a 1 WRC+ across a combined 77 plate appearances. Waldschmidt would be a clear upgrade over these three, and if he keeps hitting like this, it’s going to be hard to keep him down much longer. Once he is called up, he will be worth a look in 12-team, five-outfielder leagues, especially if you need speed.

Charlie Condon, 1B/OF, Colorado Rockies (7% rostered)

Level: Triple-A

2026 Stats: 73 PA, .322/.452/.559, 15 R, 4 HR, 12 RBI, 2 SB, 16.4 BB%, 17.8 K%, 155 wRC+

Now we’ll hop on I-40 and head southeast to New Mexico, where Charlie Condon is suiting up for the Albuquerque Isotopes. With the Rockies stuck in what feels like a perpetual rebuild, there’s very little standing in Condon’s way when it comes to reaching the major leagues. That said, the Rockies are still the Rockies, which makes them tough to predict, but there’s little doubt Condon has done enough to earn a call-up in the near future.

The 23-year-old was selected third overall in the 2024 MLB Draft out of the University of Georgia and profiles as a corner infielder/outfielder with an elite power tool. FanGraphs grades his raw power as a 70, and he’s already shown the ability to leave the yard to all fields. This season, he’s recorded a max exit velocity of 112.6 mph along with a .456 xSLG.

Charlie Condon hit his 4th homer of the season yesterday.

Should be up with the #Rockies by the end of May.pic.twitter.com/UKUdFsb0p3

— Eric Cross (@EricCrossMLB) April 13, 2026

On paper, that kind of power paired with the thin, mile-high air in Denver is a dangerous combination. Unfortunately, with his power-first profile, he’s long struggled with contact and has shown consistent swing-and-miss tendencies. While he still needs to refine his pitch recognition and timing, he appears to be making real progress with his plate discipline. In Triple-A, Condon has posted a 16.4% walk rate along with an improved 73.6% contact rate.

But when will his promotion come? With the current competition in front of him, it may not take long. At the major-league level, the Rockies are rolling with Troy Johnston at first base, while underperformers Jake McCarthy, Jordan Beck, and Tyler Freeman split time in the outfield. Condon already projects as a more impactful bat than any of them, and he has the upside to be a long-term fantasy asset.

Overall, Condon is a strong stash in 15-team leagues and should be rostered everywhere once he gets the call this summer, which could be as soon as late May. If you lack in power, you could do a lot worse than a first-round pick who plays in Coors Field.

Travis Bazzana, 2B, Cleveland Guardians (8% rostered)

Level: Triple-A

2026 Stats: 92 PA, .278/.374/.481, 13 R, 1 HR, 5  RBI, 5 SB, 13 BB%, 17.4 K%, 128 wRC+

Up next, we will visit top prospect Travis Bazzana in Columbus, Ohio. In 2024, Bazzana made history as the first second baseman ever selected No. 1 overall. That kind of label comes with expectations, and while he hasn’t fully lived up to them yet, the underlying profile still suggests he will be an everyday big leaguer. Across three levels last season, Bazzana hit .245/.389/.424 with nine home runs and 12 steals, good for a 137 wRC+.

The surface numbers are solid, but the real story is his plate discipline: a 17.6% walk rate along with a 24.3% strikeout rate.

The left-handed hitter out of Oregon State has also been making some notable mechanical tweaks. Over the past few offseasons, he has worked with Driveline Baseball, focusing on improving bat speed and adding more pull-side lift to his swing, and it’s starting to show. Over the past two weeks, he has hit one home run with seven doubles across 46 plate appearances. Even at 5-foot-11, there’s more pop here than you might expect.

Travis Bazzana is on the board!

The @CleGuardians' No. 1 prospect (MLB No. 16) slugs his first roundtripper of '26 for the Triple-A @CLBClippers. pic.twitter.com/alhjNgagHm

— MLB Pipeline (@MLBPipeline) April 18, 2026

Bazzana has also posted a career-high 110.3 mph exit velocity this season, along with a .203 ISO. At the big league level, the Guardians don’t have a long-term answer locked in at second base. Daniel Schneemann has been productive in a small sample, but Juan Brito has struggled, and Gabriel Arias is currently sidelined with a hamstring injury.

Although Bazzana may not be called up until the middle of the summer, he should be on your radar in case the Guardians suffer another injury at second base. For fantasy, he should be monitored in 15-team leagues as a solid middle-infield option once he earns his promotion.

Fantasy Baseball Pitcher Prospects To Target

Payton Tolle, SP, Boston Red Sox (22% rostered)

Level: Triple-A

2026 Stats: 15 IP, 3.00 ERA, 1.07 WHIP, 31.1 K%, 6.6 BB%, 2.52 FIP

On the final stop, we head east to Massachusetts, where the Boston Red Sox’s top pitching prospect, Payton Tolle, may not be in Triple-A much longer. Over the weekend, Tolle appeared to be on the verge of a call-up after the team skipped his scheduled start with the Worcester Red Sox, which is a move that often signals something is in the works.

Now, with Sonny Gray landing on the injured list with a right hamstring strain, the path to the majors looks even clearer.

In 2025, Tolle made three starts at the big league level, posting a 6.06 ERA, a 25.7% strikeout rate, and a 10.8% walk rate. On the surface, it looks like he wasn't fully ready, but his 4.01 SIERA suggests he pitched better than the results showed. The 23-year-old out of TCU has a major league arsenal, and he is starting to get a better feel for his pitches. His fastball sits in the 94–97 mph range with strong vertical life, which helps it play up in the zone and generate whiffs.

Payton Tolle struck out 6 in 5 scoreless innings on Sunday. pic.twitter.com/tYzAbmQmjl

— Red Sox Player Development (@RedSoxPlayerDev) April 14, 2026

His slider is his best secondary pitch, and it tunnels well off the fastball while breaking late, making it a reliable put-away option, especially against righties. He also mixes in a changeup that’s coming along nicely and gives him a legitimate weapon against left-handed hitters. In his MLB stint, he posted a 116 Stuff+, 106 Pitching+, and a 91 Location+, which tells you most of what you need to know: the stuff is there, and the command is still catching up.

However, we’re starting to see his command improve in Triple-A. So far this season, he’s cut his walk rate to 6.6% while still maintaining an elite strikeout rate. For this reason, Tolle should be stashed in all leagues, and this may be your last chance to grab him before he joins the Red Sox.

More Fantasy Baseball Prospects and Rookies