Introduction
The baseball card market is constantly evolving, with player performance, prospect hype, and fan demand all fueling dramatic shifts in card values. For collectors and investors alike, keeping an eye on card price changes can provide a huge advantage in making smart buying or selling decisions.
In this September 2025 update, SkyBox Collectibles analyzes the biggest MLB card price movers over the past 30 days. From prospects making headlines in the minor leagues to established stars whose performances are under scrutiny, this list highlights the top risers and fallers in the hobby. Whether you’re looking to buy low, sell high, or simply track the pulse of the market, this breakdown gives you the insights you need.
Top MLB Card Risers
1. Hurston Waldrep (▲ 20.10%)
Hurston Waldrep leads the charge with a 20.10% increase in card value, reflecting strong hype around his pitching performances. As one of the most promising young arms, collectors are quickly taking notice. Rising strikeout numbers and a potential call-up have only fueled demand for his cards.
2. Konnor Griffin (▲ 19.54%)
Griffin’s cards have surged 19.54%, making him one of the hottest prospects in the market. A mix of elite athleticism and strong minor-league production has collectors chasing his rookie issues. His popularity signals long-term potential for investors.
3. Roman Anthony (▲ 19.44%)
Anthony is another rising star with a 19.44% jump in card prices. His consistent batting and prospect buzz make him a favorite among hobbyists. Investors see him as a player with a high ceiling, boosting interest in his Bowman Chrome and prospect cards.
4. Junior Caminero (▲ 18.57%)
A consistent performer, Caminero’s cards rose 18.57% this month. Known for his offensive power, Caminero is proving he can be a cornerstone player. His rise shows collectors are buying into his long-term potential.
5. JJ Wetherholt (▲ 16.41%)
Rounding out the risers, Wetherholt’s cards climbed 16.41%. His strong college career and buzz as a potential draft standout have sparked demand. Collectors see his cards as undervalued compared to other prospects, making them a hot buy.
Top MLB Card Fallers
6. Jac Caglianone (▼ 15.54%)
Caglianone’s cards dropped 15.54%, reflecting cooling hype. While still a strong prospect, inconsistent performance has made collectors more cautious. This dip could present a buy-low opportunity for those who believe in his long-term talent.
7. Anthony Volpe (▼ 15.30%)
Volpe’s value has slid 15.30%, showing how quickly the market reacts to player struggles. While once considered a breakout star, his inconsistency at the plate has cooled demand. Still, as a Yankee with a strong following, he could rebound.
8. Rafael Devers (▼ 12.81%)
Devers’ cards are down 12.81%, with collectors losing some enthusiasm. A dip in production or lack of spotlight can quickly shift demand, and that’s likely what’s happening here.
9. Jackson Merrill (▼ 12.51%)
Merrill’s drop of 12.51% suggests collectors are tempering expectations. While still a valuable prospect, competition in the card market often pushes some names down when others surge.
10. Jordan Lawlar (▼ 11.72%)
Lawlar rounds out the fallers with an 11.72% decline. Injuries or inconsistent performances may have contributed to the dip. Still, his long-term outlook remains strong, meaning this could be a temporary setback in value.
Market Insights & Collector Takeaways
The card market is a reflection of both performance and perception. When a player gets hot, collectors rush in, driving up demand. Conversely, slumps or injuries can cause quick sell-offs.
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Prospects like Hurston Waldrep and Konnor Griffin are seeing surging prices thanks to breakout performances.
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Falling stars like Anthony Volpe and Jordan Lawlar remind us how volatile the market can be.
For collectors, this means timing is everything. Buying low on dips and selling into hype are strategies that can maximize returns.
FAQs About MLB Card Price Changes
1. Why do MLB card prices rise and fall so quickly?
Card values are influenced by player performance, media hype, collector demand, and even draft or trade news. One hot streak can cause prices to surge, while a slump can make them dip.
2. Are prospect cards riskier than veteran cards?
Yes. Prospects often see bigger swings in value since their future is uncertain. Veterans usually have steadier demand, though their prices may not skyrocket as dramatically.
3. How often should collectors check card price changes?
Weekly monitoring is ideal, but monthly updates like this one help collectors spot longer-term trends.
4. Is now a good time to buy cards of falling players?
Yes, if you believe in their long-term talent. Buying during dips often leads to strong returns if the player rebounds.
5. Which player is the safest investment from this list?
Players like Junior Caminero and Hurston Waldrep show consistent demand, making them safer investments than highly volatile prospects.
Conclusion
The MLB card market remains as exciting and unpredictable as the game itself. With Hurston Waldrep and Konnor Griffin leading the risers and Anthony Volpe and Jac Caglianone among the fallers, the market reflects both hype and hesitation.
For collectors and investors, staying informed is key. Use insights like these to decide when to hold, sell, or buy into the next big star.
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