Top 20 Fantasy Baseball Prospects - Dynasty Rankings for Non-Debuted Prospects (July Updates)

Andy's top 20 fantasy baseball prospect rankings for MLB prospects yet to debut in the majors as of July 2025. His dynasty prospect rankings for fantasy baseball.

Hello RotoBallers! With the All-Star break and the 2025 MLB Draft officially in the books, it's time to make some adjustments to our top-20 non-debuted MLB prospects. These prospects have all yet to reach the major leagues but stand at the top of their respective systems.

Through the first half of the MiLB season, we have seen many prospects move up through the minor leagues and, as a result, have been given a substantial boost in our rankings. After we go through our rankings, we will also spotlight a handful of the biggest risers of the first half.

Which prospects remain on the must-stash list in dynasty leagues? Could anyone overtake the top five? Let's dive in!

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Top 20 Fantasy Baseball Prospects: July Updates

Prospects That Just Missed the Cut

• Josue De Paula LAD
• Luis Pena MIL
• Thomas White MIA
• Jonah Tong NYM
• Blake Mitchell KC
• Carson Williams TB
• Emmanuel Rodriguez MIN
• Ethan Salas SD
• Charlie Condon COL

Dynasty Fantasy Baseball Prospect Outlooks

Sebastian Walcott, Texas Rangers

Sitting in the top spot is Texas Rangers shortstop Sebastian Walcott. Despite being only 19 years old, Walcott has looked quite comfortable in his first taste of Double-A and is developing into a future superstar.

Through his first 80 games with Double-A Frisco this season, the No. 4-ranked prospect on MLB.com, has posted a .244/.341/.392 line with a .733 OPS. He has swiped an impressive 22 bases while holding a 78:44 K:BB. He has gone deep 10 times and added 16 doubles.

Last season, he went deep 10 times and swiped 26 bags across 116 games with High-A Hickory. Seeing him already match these numbers in a shorter sample, while facing tougher competition, is a very encouraging sign.

Although his standard statistics may not appear impressive, a closer look reveals significant growth, considering his young age. Walcott currently sits with a 21.6% K rate, which is on pace to be the best mark of his minor league career. He has also drawn walks at a 12.2% rate, which is two points higher than his walk rate after 116 games at High-A last summer.

Despite facing tough competition this season, his ground-ball rate has only increased by two points, and his fly-ball rate dropped by two points, in relation to his production across a full season with High-A Hickory last season.

The 19-year-old could even be given a taste of Triple-A during the final weeks of the season, similar to the brief five-game look he received at Double-A to close out the 2024 season. Walcott should continue to sit comfortably as the top prospect in my ranking throughout the second half of the season.

Sebastian Walcott hit a 2-run HR to give the RoughRiders a 2-0 lead.
His 10th HR of the season. pic.twitter.com/ZtE2p6PwU1

— The Prospect Times (@ProspectTimes) July 20, 2025

Kevin McGonigle, Detroit Tigers

From a pure production basis, there may not be a better hitter in the minor leagues than Kevin McGonigle. Once viewed as the No. 2 counterpart to outfielder Max Clark, McGonigle has comfortably passed him on prospect boards and was recently bumped up ahead of Clark on MLB.com's prospect ranking.

McGonigle dealt with an ankle injury during the start of the season, which kept him out of action for just under two months. However, once he reported to High-A healthy, he was nothing short of dominant, as he posted a .372/.462/.648 line with a 1.110 OPS. During this 36-game stretch, the infielder hit an eye-catching 19 doubles, with seven home runs, and added three stolen bases.

He showed an elite eye at the plate, striking out just 19 times while drawing 23 walks. This impressive first half earned him (and fellow High-A teammates Clark and Josue Briceno) a promotion to Double-A Erie earlier in July.

Through five games with Erie, McGonigle has continued to impress, going 5-for-17 with two doubles, two RBI, one stolen base, and a 1:3 K:BB. The 20-year-old has put himself in a great position to make his MLB debut as early as the first half of the 2026 season. While it may seem unlikely, a Triple-A promotion is not out of the question during the final months of the season.

Lazaro Montes, Seattle Mariners

If there is a player that I am higher on than consensus, it would be Lazaro Montes of the Seattle Mariners. The 6-foot-5 slugger has produced elite power production ever since joining the Seattle system back in 2022.

Last season, Montes opened the campaign with Low-A but was able to join High-A for most of the second half. Through 116 combined games played at the lower levels, Montes held a .288/.397/.484 line with 21 doubles and 21 long balls.

The 20-year-old opened the 2025 season with High-A, but once again, did not need much more development at that level, as he posted a remarkable .268/.387/.572 line with 18 home runs in just 67 games. This dominant start earned him a much-earlier-than-expected promotion to Double-A in late June.

Montes has not seen his power numbers drop in Double-A, as he has held a 1.011 OPS with six home runs through 17 contests. During this stretch, he has posted an elite 52.4% fly-ball rate with a 26.2% ground-ball rate. While his hit batted-ball metrics are likely to regress to his typical numbers, Montes is emerging as one of the best power bats in the minor leagues.

He is well-positioned to debut in Seattle next season.

The Mariners promoted their No. 2-ranked prospect, Lazaro Montes, to Double-A #TridentsUp

Montes has been one of the best power hitters at High-A this season, posting a .268/.387/.572, 12 2B, and 18 HRs

Expect him to be a top-20 prospect at the end of the season pic.twitter.com/1Mi9IrrYZv

— Andy Smith (@A_Smith_FS) June 24, 2025

Travis Sykora, Washington Nationals

Now, let's look at some pitching. While Bubba Chandler and Andrew Painter typically sit as the consensus 1-2 non-debuted pitchers, Washington's Travis Sykora carries just as much upside and should be in this conversation. Sykora was selected in the third round of the 2023 MLB Draft and appeared to have been the steal of that class.

In 2024, Sykora spent the entire season with Low-A, posting a 2.33 ERA and 0.91 WHIP with a 129:27 K:BB through 85 innings of work.

However, Sykora has progressed through the Washington system at an impressive rate in 2025 and has put himself in contention to debut next season. After making two more appearances in Low-A, Sykora was bumped up to High-A. He posted a remarkable 1.21 ERA with a nearly perfect 0.67 WHIP. During these 29 2/3 innings, Sykora struck out 47 hitters while allowing only eight walks.

He then moved up to Double-A, where he had a slight step back, allowing four runs in 4 2/3 innings.

Despite his early struggles, Sykora has showcased elite strikeout upside and command and should find himself as the consensus top pitching prospect once Chandler and Painter make their MLB debuts later this season.

Ethan Holliday, Colorado Rockies

Rounding things out will be my No. 1 prospect from the 2025 class, Ethan Holliday. While I view left-handed pitcher Kade Anderson and Holliday as 1A and 1B from this year's class, I give the slight edge to Holliday.

The 18-year-old was selected with the fourth overall pick by the Rockies out of Stillwater High School in Oklahoma. Entering the draft, MLB.com ranked Holliday as the top prospect in the class for good reason. He was given an impressive 65 Power score and 60 Overall score, despite his raw 18-year-old profile.

He is credited with having immense power upside given his 6-foot-4 frame. His left-handed swing could continue to produce 30+ HR upside once he reaches the majors, which could even play up given his perfect landing spot in Colorado.

The only negative on his profile is that he could struggle at shortstop. However, his bat is worth closely monitoring as he progresses through the lower levels of the Colorado system. While his MLB debut is already three seasons away, he should find himself near the top of many boards by the midpoint of the 2026 season. He is my top pick in all FYPD.

On top of batting .611 with 19 home runs, Ethan Holliday took on an important leadership role.

He's our 2025 High School Player of the Year. https://t.co/mKnh9rrYKO pic.twitter.com/Kti4yxD9Lh

— Baseball America (@BaseballAmerica) July 1, 2025

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