As July comes to a close, it’s time to take a look at the biggest dynasty prospect risers and fallers from the month. Several prospects took major steps forward with promotions and breakout performances, while others struggled to meet expectations. Here are three players whose stock is climbing rapidly as we head into the second half of the season.
Andrew Fischer, 3B, Milwaukee Brewers
Andrew Fischer has firmly established himself as one of the biggest risers of July. While the Brewers boast one of the deepest farm systems in baseball—headlined by consensus No. 1 overall prospect Jesus Made, Cooper Pratt, and Luis Lara—Fischer has forced his way into the conversation with an incredible offensive season. The Brewers’ 2025 first-round pick has showcased exactly why the organization invested in him so highly.
Known primarily for his power, Fischer has delivered in a big way, launching 33 home runs this season, including 11 since the All-Star break and seven during the month of July. Currently at Double-A, he is slashing .289/.425/.682 with a remarkable 1.107 OPS across two levels. His ability to impact the baseball has made him one of the most dangerous power hitters in the minor leagues.
The biggest concern remains the swing-and-miss in his game. Fischer owns a 32.9% strikeout rate and a 64.0% contact rate, both areas he will need to improve as he advances toward the major leagues. From a dynasty perspective, however, managers can live with the elevated strikeout rate because of his immense power upside. If he continues producing at this pace, Fischer has the potential to become one of the better fantasy third basemen in the coming years and should be rostered in virtually every dynasty format.
Tate Southisene, SS, Chicago Cubs
Another major riser this month is Tate Southisene, the 2025 first-round pick who has quickly climbed the minor league ladder. After impressive performances between Single-A and High-A, Southisene recently earned a promotion to Double-A, further validating the strong start to his professional career.
In July, the athletic middle infielder slashed .292/.404/.472 with an .876 OPS, while posting a season line of .278/.408/.467 with an .875 OPS. His game is built around speed, contact, and athleticism. Southisene owns a strong 76.4% contact rate, and while he isn’t known as a pure power hitter, he has already launched 11 home runs this season, demonstrating more pop than many evaluators expected.
Where Southisene truly shines is on the basepaths. His 38 stolen bases make him one of the premier speed threats in the minor leagues, giving dynasty managers a player capable of contributing across multiple categories. If he continues adjusting well to Double-A pitching, he could position himself for a major league debut sometime during 2027 or early 2028.
Nolan Perry, RHP, Toronto Blue Jays
Rounding out this month’s risers is Nolan Perry, who has quietly become one of the fastest-rising pitching prospects in baseball. The 2022 12th-round pick has battled injuries over the past two seasons, but now healthy, the 22-year-old has put together a breakout campaign while climbing through three levels of the Blue Jays’ farm system before recently earning a promotion to Double-A.
Across those three levels, Perry owns an outstanding 2.41 ERA with 86 strikeouts in 56 innings, showcasing some of the best swing-and-miss stuff in the organization. His fastball now reaches the upper 90s with impressive life, and he complements it with a deep arsenal featuring a curveball, slider, and splitter that consistently generate whiffs.
Perhaps the most encouraging development has been Perry’s improved command. He currently owns a career-best 8.6% walk rate, a significant step forward that has helped unlock his impressive arsenal. Perry is currently being monitored after sustaining a concussion, but assuming he returns soon, he has a legitimate chance to continue his breakout and position himself as a potential rotation option for Toronto as early as next season.
Aidan Miller, SS, Philadelphia Phillies
Now that we’ve highlighted some of July’s biggest risers, it’s time to take a look at a few prospects whose stock has slipped. First on the list is Aidan Miller, though his placement here has much more to do with availability than talent. The Phillies’ top prospect has been sidelined for much of the season due to injury and is still not swinging a bat, making it increasingly likely that 2026 will be a lost year for the 22-year-old.
When healthy, Miller possesses one of the most exciting fantasy profiles in the minor leagues. Last season, he showcased his enticing power-speed combination, launching 14 home runs while stealing an incredible 59 bases. That type of production gives him legitimate five-category fantasy upside and is the reason he has consistently ranked among baseball’s top prospects.
The challenge for Miller is that the shortstop prospect landscape has become incredibly deep. Dynasty managers now have elite names such as Jesus Made, Eli Willits, Sebastian Walcott, and 2026 No. 1 overall pick Roch Cholowsky climbing the rankings, which has caused Miller to fade from the spotlight despite his immense talent.
This is by no means a reason to panic. Miller is still just 22 years old, and his long-term upside remains extremely high. However, the injuries have delayed what many expected to be his major league debut this season, making him one of July’s biggest dynasty fallers simply because he has been unable to stay on the field. Dynasty managers should remain patient, as the talent is still very much intact once he returns to full health.
Devin Fitz-Gerald, INF, Washington Nationals
Another infielder whose stock has cooled recently is Devin Fitz-Gerald, who was acquired by the Nationals in the MacKenzie Gore trade earlier this season. The 20-year-old has faced an adjustment since arriving in the Nationals’ organization, particularly after reaching Double-A, where he has struggled to find consistent success at the plate. Since the promotion, Fitz-Gerald is slashing .193/.261/.243 with a .504 OPS and one home run, numbers that have been disappointing for dynasty managers.
Looking at the full season, however, the picture is a bit more encouraging. Fitz-Gerald owns a .237/.329/.412 slash line with a .741 OPS, showing that there is still a solid offensive foundation to build upon. He has long been regarded as a polished hitter with an above-average hit tool, but his power projects to be closer to average, which could ultimately limit his fantasy ceiling compared to some of the elite infield prospects around the game.
That said, Fitz-Gerald still brings value with his athleticism. He has the speed to develop into a 15-20 home run, 15-20 stolen base player at the major league level, giving him a well-rounded fantasy profile if the bat continues to progress. At just 20 years old, there is no reason for dynasty managers to panic. The transition to Double-A can be challenging for young hitters, and this is simply a situation worth monitoring as he adjusts to more advanced pitching.
Tyler Bremner, RHP, Los Angeles Angels
Rounding out this month’s fallers is Tyler Bremner, the No. 2 overall pick in the 2025 MLB Draft. While expectations remain extremely high, his first full professional season hasn’t gone quite as smoothly as many anticipated. Pitching at High-A, Bremner has posted a 4.36 ERA, and although the raw stuff remains outstanding, the results have been inconsistent.
Opposing hitters are batting .253 against him, and he owns a 1.36 WHIP, both of which are higher than the Angels would like to see from one of their top pitching prospects. The encouraging news is that the underlying strikeout and walk numbers remain strong. Bremner continues to miss bats at an elite rate with a strikeout rate north of 30%, while maintaining a respectable 9.2% walk rate. His fastball and changeup still project as plus pitches, and his overall arsenal continues to profile as that of a future frontline starter.
The biggest concern has been his recent stretch of outings. Bremner struggled to an 8.74 ERA during the month of July, suggesting there are still adjustments to be made as he faces more advanced competition. Whether it’s improving his command within the strike zone or limiting hard contact, there are areas of his game that will need refinement.
There is no reason for dynasty managers to panic. Bremner still possesses some of the best pure stuff in the minor leagues and has the ceiling of a future top-of-the-rotation arm. This is simply a reminder that even elite pitching prospects experience growing pains early in their professional careers. His long-term outlook remains extremely bright, but his recent performance is something dynasty managers should monitor closely.
