Who's Up? Prospect Autos with the Largest Gains - 8/21/25 (Part 2)

As the season grinds on, the card market is continuing to reward both breakout performances and speculative hype. Short-term windows often highlight flash-in-the-pan runs, but looking at the top 30-day and 60-day risers gives us a more balanced view of who’s sustaining value and who might be peaking. This edition highlights a diverse group: rookies making their first impressions in the majors, prospects driving momentum with promotions, and younger players flashing upside in the lower levels. Across the board, the theme remains the same—timing is everything. Whether you’re flipping for quick ROI or looking to stash players with long-term upside, understanding the balance between performance and price movement is the key.

Remember that “specific circumstances” are always a mix of factors: age, performance (real stats), pricing (Hobby+ average price), and peak projections (via Hobby+ and the Prospects Live App Suite). There’s no exact formula or single “correct” approach. Use these articles, alongside your own historical experience, to make the most informed decisions possible.

Top 5 30-Day Risers

1. Warming Bernabel: $5.60 → $22.76 (+306%)
   30-Day Stats: AVG .301 | ISO .241 | wRC+ 125 | HR 4 | Games 22

Analysis: Another week, another Warming Bernabel write-up. This guy has far exceeded expectations and has maintained a relatively strong performance at the MLB level. Since being called up in July, he has posted a .301/.326/.542 slash line with four home runs over his first 22 MLB games. Although the slash line is strong, it should be noted that his recent performance has slowed down.
His slash line over his first seven MLB games:
.500/.517/1.036
His slash line from his last 15 games:
.200/.228/.291
Although his performance has slowed down, the sustained slash line is still quite impressive, and he recently capped off his 30-day splits with a walk-off single against the Dodgers on August 18th.

Recommendation: Sell
It has been a story of two halves for Warming Bernabel. He was playing out of his mind over his first seven MLB games, but his performance has since come back down to earth. At this point, it feels like his most recent uptick in value may be more driven by headlines, including his recent walk-off single and the Rockies’ run during one of the longest winning streaks in MLB. The sustainability is questionable (especially considering his lack of production over recent weeks), and prices will likely drop back down to under $20 as time progresses.

2. Carson Benge: $55.00 → $127.45 (+132%)
   30-Day Stats: AVG .308 | ISO .253 | wRC+ 169 | HR 6 | Games 22

Analysis: Carson Benge's prices have exploded over recent weeks, and he certainly has the stats to back it up. He made his AAA debut on 8/12/25 alongside a group of top Mets prospects. Unfortunately, his debut was short-lived, as he was placed on the 7-day injured list with an undisclosed injury.
Despite the setback, Benge had a spectacular July, slashing .397/.482/.726 with seven home runs, 17 RBI, and 22 runs in 23 games. His performance earned him Eastern League Player of the Month honors. His season slash line (.306/.413/.504) across three MiLB levels is also rather impressive.

Recommendation: Monitor The Situation
The severity of his injury and length of absence will go a long way in determining the next move. If his prices fall below $80, he becomes a must-buy prospect. Prior to his injury and promotion, he was beginning to look like a consensus Top 10 prospect, with speculation surrounding a potential MLB debut this season. While it is unclear how the market will react given the undisclosed nature of his injury, he is definitely a prospect that should remain on your radar.

3. Jeremiah Jackson: $5.49 → $12.69 (+131%)
   30-Day Stats - MLB: AVG .341 | ISO .114 | wRC+ 125 | HR 0 | Games 14
   30-Day Stats - MiLB: AVG .321 | ISO .357 | wRC+ 176 | HR 3 | Games 7

Analysis: Jeremiah Jackson's prices have dropped off as the hype around his debut has faded. His performance has been solid, with a .341/.356/.455 slash line, but his power has been non-existent and he has struggled with plate discipline, posting just a 0.08 BB/K since his debut. While he is getting on base, his prospect profile has yet to generate much excitement, and he has not captured significant hobby interest. He made his MLB debut on 8/01, which coincided with his two highest sales over the last two months. Since then, there have been seven unique sales, all below peak pricing, with prices most recently plateauing around $10. His AAA slash line was impressive: .377/.400/.673 with 11 home runs and 22 RBI's in 40 games. The power is clearly there, but it has not yet translated to the MLB level.
Currently, he is on a five-game hitting streak, with multiple hits (including three on 8/17) in each of his last three games. His recent performance suggests that he deserves a roster spot and will likely remain on the MLB roster. As such, he might be worth a gamble. Prices will likely bounce back once he connects for his first MLB home run.

Recommendation: Buy
As mentioned above, this feels like a low-risk, high-reward type of investment. Nothing is guaranteed, of course, and his card prices could still fall, but a $10 gamble would not be detrimental to long-term portfolio growth. Since his debut, his performance has been impressive, with an above-average slash line over his first 14 MLB games—enough to sustain his presence in the majors. Picking up a couple of autos around $10 seems like a worthwhile play. We’ve already seen his cards reach $18+ once before, and if he hits his first MLB home run, there’s little reason why they couldn’t reach that level again. A $10 purchase flipped for $20, even after factoring in eBay fees and free PWE shipping, would net roughly $5.50—a very strong ROI for such a small investment.

4. Owen Caissie: $48.75 → $110.00 (+126%)
   30-Day Stats - MLB: AVG .125 | ISO .000 | wRC+ -37 | HR 0 | Games 3
   30-Day Stats - MiLB: AVG .353 | ISO .221 | wRC+ 155 | HR 3 | Games 19

Analysis: Owen Caissie’s call-up by the Cubs during their series in Toronto felt more like a ceremonial debut than a permanent roster move, giving him a chance to play in front of family and friends. He debuted on 8/14, but didn’t see consistent action until a few days later. By 8/18, he had his first hit, and during the Cubs/Brewers doubleheader he broke out with his first MLB home run, a two-run single, and then another homer in the second game — finishing the day with three RBIs. That performance likely reignited hobby hype after an initial pullback in prices ($160 → $90). His offensive profile is well-rounded, with real power and on-base skills, but his 28.6% K% since debuting remains a red flag that could cap long-term value. Still, his 22 home runs and .955 OPS in 93 AAA games this season underscore why collectors are paying attention.

Recommendation: Sell/Hold
While his doubleheader heroics may have pushed prices back toward peak levels, the volatility and high buy-in make him too risky for fresh investment. If you’re already holding, it could be worth seeing how the market reacts to his hot start — but at $150+, I’d rather take profits than gamble on sustained production.

5. Alfonsin Rosario: $13.16 → $29.63 (+125%)
   30-Day Stats: AVG .230 | ISO .186 | wRC+ 108 | HR 4 | Games 25

Analysis: Alfonsin Rosario was promoted to AA on 8/05 after slashing .268/.362/.490 with 16 home runs and 11 steals over 82 games at A+. Before his promotion, he was named Midwest League Player of the Week after hitting .471 with a 1.525 OPS and two home runs. Since moving up to AA, he has shown some early struggles, batting .200/.286/.340 with 2 home runs over his first 12 games while striking out at a 33.9% clip. Rosario has an appealing hobby profile but has consistently battled strikeout issues throughout his MiLB career. The silver lining is that he remains young for his level and continues to show positive progression. At just 21 years old, now in his third professional season and already at his fourth level, there’s reason to believe in further development. The Guardians also have a strong track record in player development, which could help refine his plate discipline moving forward.

Recommendation: Monitor The Situation
Rosario’s age, power, and progression make him a player worth tracking, but his current market feels a bit high. His prices spiked after the AA promotion, though recent struggles have brought them back down. His market seems to plateau around $40, with the most recent sale at $30. While I like him long-term, I would prefer an entry point under $25. If his market softens into the offseason, he could become an attractive investment target.

Top 5 60-Day Risers

1. Chase Harlan: $10.56 → $29.00 (+175%)
   60-Day Stats: AVG .280 | ISO .258 | wRC+ 130 | HR 8 | Games 33

Analysis: Chase Harlan’s first professional season has been a mixed bag. He opened the year in the CPX, slashing .288/.356/.500 over 42 games. While his early results were solid, he seemed to truly break out in late June and early July—his performance spike clearly coinciding with short-term price increases. On 7/25, he earned a promotion to Single-A, which again created a temporary bump in his card values. Since debuting there, he’s posted a .262/.348/.443 slash line—respectable, though not outstanding. Harlan’s profile shows flashes of promise, but also real concerns. His power grades out above average, but his hit tool, speed, and defense all grade below average, which limits his long-term ceiling. At just 19, he’s still young and has time to develop, but his current profile feels more boom-or-bust than bankable.

Recommendation: Sell/Hold
Harlan is an exciting but risky investment. His above-average raw power is already translating into game results, with a .203 ISO across CPX and Single-A. However, his below-average hit tool, speed, and defense make him a tough long-term bet unless he makes significant strides in overall consistency. He is progressing quickly through the minors, which allows us to monitor his performance across levels and relative to his age. Still, his current pricing feels inflated. If you’ve already bought into Harlan, there may be short-term profit potential as he adjusts further to Single-A. Otherwise, this is best approached as a “take profits now, reinvest later” type of play.

2. Dakota Jordan: $14.62 → $33.21 (+127%)
   60-Day Stats: AVG .330 | ISO .296 | wRC+ 166 | HR 9 | Games 27

Analysis: Dakota Jordan’s second professional season has been far more promising than his injury-shortened debut. Last year he was limited to just two games, offering little usable data. This year, however, he’s bounced back strong, appearing in 88 games at Single-A and slashing .311/.377/.497 with 14 home runs and 27 stolen bases. At one point, he was tied for the league lead in home runs and led the Cal League in hits—though his recent IL stint likely cost him those titles. Unfortunately, health remains the biggest obstacle. After missing time in July, he returned briefly on 8/01 before landing back on the 7-day IL on 8/10 with an undisclosed injury. His raw tools check nearly every box for a hobby profile—power, speed, production—but his inability to stay healthy continues to cloud his long-term outlook.

Recommendation: Monitor The Situation
Jordan has the makings of an ideal investment candidate—above-average power, plus speed, and strong statistical output—but his injuries are a serious concern. He missed nearly all of his debut season with a hamstring issue, and this year he’s already on his second IL stint in less than a month. These setbacks are putting him behind the developmental curve, and repeated injuries can significantly hinder long-term price growth. As much as I’d like to invest, the durability risk outweighs the upside for now. That said, the market has already reacted negatively to his most recent IL stint, which could create a future buying window. We’ll revisit Jordan and other “Monitor The Situation” players later this season, particularly if prices dip to more favorable entry points.

3. Carter Jensen: $14.80 → $33.20 (+124%)
   60-Day Stats: AVG .271 | ISO .353 | wRC+ 144 | HR 12 | Games 37

Analysis: Carter Jensen has put together a strong season. At Double-A, he led the Texas League in hits (80), total bases (115), and batting average (.292), achievements that earned him a spot in the 2025 All-Star Futures Game and a subsequent promotion to Triple-A. Since moving up, his batting average has dipped and his strikeout rate has climbed, but his OBP and SLG have improved, and he’s shown impressive power with 11 home runs in just 35 Triple-A games. Plate discipline has also been a hallmark of his game—since 2022, he has drawn 277 walks, ranking 5th among all minor leaguers. Recently, he’s been heating up again, going 7-for-17 with 3 home runs and 6 RBI over his last five games. With service time no longer an obstacle, the Royals could look to give him MLB reps soon, which would likely reignite hobby interest and create a near-term investment window.

Recommendation: Buy
Jensen has the skill set and profile collectors look for, and the volatility of his market may actually work to an investor’s advantage. If autos can be scooped up around $30 or less, a move to $50 seems realistic, particularly if he gets the call to Kansas City. Prices could soften in the offseason, so waiting to see how the market moves is also a viable approach. Either way, his combination of plate discipline, power, and proximity to the majors makes him an intriguing buy.

4. Josh Adamczewski: $16.26 → $34.59 (+113%)
   60-Day Stats: AVG .352 | ISO .222 | wRC+ 185 | HR 3 | Games 31

Analysis: Josh Adamczewski has been one of the hottest hitters in the minors over the past couple of months, producing a .352/.458/.574 slash line with a 1.24 BB/K ratio and three home runs. His strong performance earned him a promotion from Single-A to High-A, marking his third level in as many seasons. While he may not carry the same hype as top-prospect teammates Jesús Made and Luis Peña, Adamczewski continues to make a strong case as a legitimate prospect. With clutch hitting, above-average power, and excellent plate discipline, he possesses the kind of skill set we look for in a long-term investment. At just 20 years old, he is progressing quickly and already showing an advanced offensive profile.

Recommendation: Monitor The Situation
The initial buying window may have already passed, but opportunities could resurface this offseason. If his performance at High-A stabilizes and prices cool, picking up autos around $30 or less would be appealing. There is still potential upside at current levels, but the risk/reward balance is less favorable. For now, the best approach is patience—monitor how the market adjusts heading into the offseason and be ready to strike if prices dip.

5. JJ Wetherholt: $84.78 → $177.10 (+109%)
   60-Day Stats: AVG .288 | ISO .315| wRC+ 158 | HR 12 | Games 38

Analysis: JJ Wetherholt has been nothing short of dominant since his promotion to Triple-A on July 9. Over 26 games, he has slashed .310 with a 1.073 OPS, nine home runs, and three stolen bases. His consistent production includes multiple three-hit games, and he currently ranks among the top players in both slugging and OPS since his call-up. Unsurprisingly, this surge has translated directly into his card market. Just two months ago, his base autos were available for under $80—today, it’s difficult to find them below $180. With his strong performances making headlines and his status as one of the game’s premier prospects cemented, the price surge makes sense. That said, with only two prospects in the hobby currently commanding values north of $200, the risk/reward calculus feels unfavorable at these levels.

Recommendation: Pass
The buying window has closed, and Wetherholt’s prices have already climbed by roughly $100 in the past two months. This is a clear case of a missed opportunity rather than a current one. The lesson here is to capitalize early, particularly around product release windows and with high-profile prospects. While Wetherholt’s ceiling may continue to climb, the current price point carries more risk than I am comfortable taking on.

If there’s one takeaway from these lists, it’s that not all “risers” are created equal. Warming Bernabel’s early MLB success fueled short-term hype, but his cooling bat suggests a “sell now” approach before prices normalize. Conversely, Jeremiah Jackson or Carter Jensen offer the kind of low-risk, high-reward profiles that can quietly double your money if timed correctly. Injuries complicate the picture—Carson Benge and Dakota Jordan have strong hobby profiles, but their absences make ROI projections murky.

That’s why it’s important to think in terms of margins, not home runs. A $10 buy that flips for $20 after fees still nets you ~$5.50—over a 50% return. Even smaller wins, like flipping a $30 card for $40, can produce steady gains that compound over time. The big jumps are exciting, but consistency in stacking smaller profits is where true portfolio growth comes from.

As we head into the stretch run, don’t get caught chasing peaks. Instead, identify where the market is overreacting, take profits when they’re available, and look for undervalued names that may reset in the offseason. The players worth holding are the ones whose skills can sustain production beyond a single hot streak.

Sell heat, Buy skill—that mantra remains the clearest path to long-term ROI in this volatile market.