Have you ever wondered which prospects have seen the highest gains in their 1st Bowman Chrome Base Auto cards over different timeframes? Have you ever wondered what drives changes in pricing? In this article we highlight the 10 highest risers over over the last 30 days and break down underlying stats that seem to be driving prices. Unfortunately, there is no fool-proof way to forecast price growth, but knowing what stats may influence price growth will hopefully help future purchasing decisions!

Amongst this list are some of the hottest hitters in the MiLB over the last 30 days (like Kevin McGonigle), some players who's price growth is better explained off-the-field (Josh Adamczewski), and some players who's price growth remains unexplained (Jett Williams). With larger sample sizes and more historical pricing "snapshots", we will continue to revisit this topic, working to understand what drives price growth. As we move forward, I will likely reduce the number of prospects to five, over multiple different timeframes (Top 10 Risers - Last 60 Days will be released soon) so that we can release these articles with more frequency. I also want to expand to understanding prospect "fallers" and what stats may contribute to declining prices. As always, if you have any comments/questions/concerns, please feel free to reach out to me on Twitter (@dahldoescards) or on Discord (@dahl) and I will try to respond as soon as I can. Without further ado, here are our Top 10 Risers over the Last 30 Days!

Top 30-Day Risers:

Kevin McGonigle: $70.40 → $127.30 (+81%)

AVG: 0.352 | ISO: 0.264 | wRC+: 191 | BB%: 11.3% | K%: 7.5% | HR: 5 | SB: 2
AA Debut - 07-08-2025

Analysis: Batting .352, with power and plate discipline is almost unheard of, but over the last 30 days, Kevin McGonigle has been raking at A+. His performance has been so impressive, he forced his way to a promotion to AA at 20-years-old. There is a lot of speculation regarding the first overall prospect, once Roman Anthony graduates, and some seem to think he could be that guy. If that's the case, I find it hard to believe that we have come close to reaching his ceiling price, but tread carefully as only 3 players with prospect status (Roman Anthony, Konnor Griffin, and Jac Caglianone) have seen prices surpass $200+.

Konnor Griffin → $212.11 → $256.60 (+21%)

AVG: 0.312 | ISO: 0.194 | wRC+: 160 | BB%: 11.7 | K%: 19.8 | HR: 4 | SB: 14
A+ Debut - 06-10-2025

Analysis: Konnor Griffin has seen rather ridiculous gains since I started tracking "daily snapshots" - nearly doubling in value since April 19, 2025. Since the start of the season, he has been somewhat consistent , but has seen a slight downtick in BA (.330 season AVG) with increased plate discipline.

Jett Williams → $28.64 - $65.80 (+130%)

AVG: 0.277 | ISO: 0.223 | wRC+: 162 | BB%: 16.5 | K%: 24.3 | HR: 2 | SB: 7

Analysis: Performing well above league average, with good power. Good power/speed combo, especially considering his smaller stature. Above average power over the last 30 days, otherwise stats are relatively average/unremarkable. His rise in price is rather confusing. He has not been promoted, nor has he lit the world on fire over the last 30 days. Additionally, he reached AAA last season, but has remained at AA to start this season.

Spencer Jones → $119.85 - $153.60 (+28%)

AVG: 0.389 | ISO: 0.411 | wRC+: 243 | BB%: 14.9 | K%: 27.2 | HR: 11 | SB: 7
AAA Debut - 06-27-2025

Analysis: The numbers speak for themselves - I mean this dude has been out of this world over the Last 30 days. As he has climbed through the minors, there has been some concern for his plate discipline, averaging a 28.9 K% in 2023 (A+, AA), 36.8 K% in 2024 (AA), and a 33.1% K% so far this season between AA, AAA. The longevity of such large strikeout rates is questionable, but it seems people are buying into this hot streak. Personally, I think this is a sell-high opportunity and would strongly advise against buying into somebody who's K% was previously described on Fangraphs as "...a terrifying, bust-indicating level in 2024". Sure there is always room for improvement, but I would rather stay away!

Harry Ford → $56.94 - $88.64 (+56%)

AVG: 0.296 | ISO: 0.167 | wRC+: 111 | BB%: 14.7 | K%: 16.5 | HR: 3 | SB: 1

Analysis: I'm not sure what to say here - price increase was likely largely driven by reports that he would be joining the team, on the road, for their series against the Rangers. This announcement occurred on 6/26/25. Unfortunately, he did not make his debut during his stint with the team, and his path remains somewhat blocked. So far this season, he has started 54 games at C and only 14 games at DH. I find it unlikely that the Mariners want to waste his defensive capabilities by utilizing him at DH, but who knows!

Carter Jensen → $14.80 - $44.07 (+198%)

AVG: 0.305 | ISO: 0.326 | wRC+: 164 | BB%: 10.4 | K%: 31.1 | HR: 8 | SB: 3
AAA Debut - 06-24-2025

Analysis: The underlying statistics are rather impressive. But since his promotion to AAA, he has struggled mightily with plate discipline and strikeout rates. It will be interesting to see how prices change as the season continues.

Josue Briceño → $38.74 - $64.99 (+68%)

AVG: 0.379 | ISO: 0.207 | wRC+: 200 | BB%: 12.7 | K%: 9.9 | HR: 2 | SB: 0
AA Debut - 07-08-2025

Analysis: Another player in the Tigers farm who has played exceptionally well this season. I don't know if it's the player or the system, but the numbers are impressive with ridiculous plate discipline. Josue Briceño is one of my favorite players in the 2025 Bowman Baseball release and may benefit from a rather recent product release - the market has had some time to settle, but some "market inefficiencies" remain. In this case, I feel this may be an example of such. The longer he sustains this performance, the higher the price goes. Not sure where his hobby ceiling is, but I wouldn't be surprised to see this reach $100+ by the end of this season.

Samuel Basallo → $97.40 - $121.35 (+25%)

AVG: 0.286 | ISO: 0.238 | wRC+: 153 | BB%: 17.3 | K%: 14.8 | HR: 4 | SB: 0

Analysis: Not much to say here. Power hitter who may never be promoted to the big leagues. The Orioles are currently 37-49, with Adley Rutschman out due to injuries, yet they still choose to start Jacob Stallings. I am aware that there are some defensive concerns present and the Orioles want more time to develop his defensive skillset, yet he keeps starting games at DH. How they expect him to improve defensively when not asked to play defense is beyond me! If he remains in the minors, long-term, he's probably reached his ceiling. If he makes his debut, it's possible that he sees a short-term spike, but I would be surprised to see this go much higher.

Josh Adamczewski → $15.30 - $37.60 (+146%)

AVG: 0.294 | ISO: 0.176 | wRC+: 121 | BB%: 14.3 | K%: 23.8 | HR: 0 | SB: 0
Season Debut - CPX rehab stint began on 07/01/2025

Analysis: This is an interesting one, and is likely due to one auction ending at $81 with 22 bids/6 unique bidders. The winner has a significant number of reviews, but the winning bid was way too high. There are currently multiple base autos listed with a BIN, significantly lower than this end price. He's a fine player, but with average power, he's rather underwhelming in terms of the hobby.

Esmerlyn Valdez → $27.14 - $47.21 (+74%)

AVG: 0.323 | ISO: 0.258 | wRC+: 174 | BB%: 8.6 | K%: 21.0 | HR: 5 | SB: 2
AA Debut - 07-01-2025

Analysis: Esmerlyn Valdez has been on fire too start this season and was leading the MiLB in HRs until quite recently. He is still tied for 5th. If we were to place qualifications on age - specifically age < 25, he would rank 3rd behind Lazaro Montes and Spencer Jones. Since being promoted to AA, he has not yet hit a HR, but it feels as if it's only a matter of time.