MLB Prospect Debuts: Fantasy Baseball Waiver Wire Pickups and Rookie Stashes (Week 12)

Mike's fantasy baseball prospect stashes, sleepers, and rookie waiver wire pickups for Week 12 of 2025 -- recent MLB prospect debuts and potential call-ups to monitor.

As we welcome the official arrival of summer this week, so goes the expected call-ups of prospects to their collective major league teams. Last week, we covered the sensational call-ups of talented prospects Roman Anthony and Kyle Teel, while also speculating on the recall of top pitcher Jacob Misiorowski in Milwaukee. Lo and behold, Misiorowski was called up to make his debut the day after we published the article.

While it's surely exciting to land one of these players on your roster, keep in mind there will be ups and downs. Some start very hot and cool off. Others struggle before finding their stride. Still, others may need more time in the minor leagues to hone their craft after a brief run in the majors. It is never the same experience for the players, or for us as fantasy managers.

These players offer intriguing upside for the fantasy manager willing to show patience with rostering a young player, as opposed to rostering a boring veteran who may not help your team at all. Let's take a look at a few players who intrigue fantasy players.

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Fantasy Baseball Hitter Prospects To Target

Christian Moore, 2B, Los Angeles Angels 

Status: Called Up

2025 stats (MLB): 11 PA, .100/.182/.300, 2 R, 0 HR, 0 RBI, 0 SB, 9.1% BB%, 27.3% K%, 26 wRC+

Moore got the call last weekend that he was coming to the Angels. The 2024 first-round pick will plug in at second base and looks like he could have an extended run at the position. What I like about Moore is evident in the Statcast bat tracking below.

His average bat speed thus far is three ticks more than league average. Moore is currently hitting ninth for Los Angeles, but his calling card is power. This is a player who hit a whopping 34 home runs as a junior at Tennessee, and the hit tool is considered to be below average for major league hitters.

This is a power play, pure and simple. Moore has chipped in eight stolen bases in Triple-A so far this season. But if you are picking Moore, expect some swing and miss with a powerful swing that will eventually include the long ball.

Daylen Lile, OF, Washington Nationals 

Status: Called Up 

2025 stats (MLB): 39 PA, .206/.263/.441, 5 R, 1 HR, 3 RBI, 0 SB, 5.1% BB%, 17.9% K%, 90 wRC+

Lile was up earlier this year, and then sent back down to begin June. Less than two weeks later, he is back. Lile is playing right field and batting in the lower third of the order in Washington, but it looks like he might stick around after the Robert Hassell III experiment did not go as well as hoped.

Lile homered on Monday night, his first one in the major leagues. Interestingly, his batting average is a paltry .206 in 39 plate appearances, but his xBA is .287. He doesn't strike out much (17.9% thus far) and gets the bat to the baseball. The Nationals seem inclined to give young players an opportunity right now at 30-42. Expect Lile to get some runs in both center and right fields.

Fantasy Baseball Pitcher Prospects To Target

Grant Taylor, RP, Chicago White Sox

Level: Called Up

2025 Stats: 3 IP, 6.00 ERA, 1.67 WHIP, 28.6% K%, 7.1% BB%, 1.40 FIP

Taylor is an interesting story if you are unfamiliar with him. While at LSU, he was considered its top starter until this guy named Paul Skenes showed up. Taylor then had to have Tommy John surgery. The White Sox selected him in the second round of the draft even while knowing that he faced a long rehabilitation from the elbow injury. This season, they moved him to the bullpen.

The organization has a history of doing this with top prospects before unleashing them in the rotation; they have followed similar pathways with Mark Buehrle, Chris Sale, and Garrett Crochet. Taylor could be in the closing mix before too long on a White Sox team that is developing talent at the major league level.

Jacob Misiorowski, SP, Milwaukee Brewers 

Level: Called Up

2025 Stats: 5 IP, 0.00 ERA, 0.80 WHIP, 29.4% K%, 17.6% BB%, 3.47 FIP

I wrote about Misiorowski last week as one to watch for a call-up in the second half. Well, the next day, the Brewers recalled him and put him right into the rotation.

Even as the Brewers rotation has stabilized this season, many folks were calling for the likes of Misiorowski and Logan Henderson to be on the major league roster. Misiorowski has continued to be impressive, with four wins in 12 starts this year, with terrific ratios (2.13 ERA, 1.09 WHIP) and tremendous strikeout ability.

Misiorowski is known for the big fastball at 99 MPH, but he also mixes in a high-velocity slider and a curveball. He will also mix in the occasional change-up, but this is more of a show-me pitch. To stick in the rotation long-term, the big righty will need to be able to locate his pitches better and avoid walks, which have plagued him in the minor leagues (12.3% in 2025 in Triple-A).

In his first start last week, he was impressive. He appeared to twist his ankle in the sixth inning, which led to his departure; later, he said he was suffering from cramping from dehydration. He is scheduled to make his second career start on Wednesday night.

Noah Schultz, SP, Chicago White Sox 

Level: just moved to Triple-A Charlotte last weekend 

2025 Stats: 56.2 IP, 3.34 ERA, 1.59 WHIP, 23.2% K%, 14.4% BB%, 3.83 FIP

The top prospect in the White Sox farm system was just called up to Triple-A Charlotte over the weekend, to the surprise of some. His best pitch in the minor leagues thus far, by and away, has been the slider, which often hits 3,000 RPM.

Schultz has an average fastball that shows good velocity and promise, but he doesn't have a high strikeout rate. The Chicago White Sox director of pitching, former big league pitcher Brian Bannister, suggested that the organization is challenging him to pitch without his customary cutter usage to focus on his other secondary pitches.

Even though Schultz is 6'10", his lower arm slot appears to make the ball come from an angle that makes him almost impossible for lefties to hit. He is now one step from the major leagues, where he will work on his walk rate, control, and command.

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