Slammers High School Pitching Eval Recap: Summer 2025
Who had the best spin, movement, pitchability, velo, Engine Score, etc. from May evals?
During May 2025, Slammers held a couple of high school evaluation days where pitchers had an opportunity to throw bullpens with Rapsodo data captured. While most pitchers threw at this time, a handful were still in the midst of a state-playoff run and did not throw. It is our hope that we will fill in the gaps during the Slammers Showcase from August 6-8. For those who did throw, see below for a number of leaderboards on select metrics.
For context, each bullpen is thrown at roughly 90% of what a player shows on a game mound - most guys get a couple extra velo ticks when they get on the bump in a competitive game. What are we able to derive from 90%? Well, guys who can spin show spin at 90% just as well as on a game mound. Also, we have years of history of dozens of D1 and pro arms throwing in this same format, so any comparisons we’re making here are apples-to-apples.
Pitch Score Leaderboard
Mikey Kroll (Bitzer 2027) led the way on the Pitch Score leaderboard.
The Pitch Score is a simple stuff model that accounts for and weights pitch velocity, spin, vertical movement, and horizontal movement relative to each pitch type. For this leaderboard, we only considered pitchers with at least 3 different pitch types from their bullpen session. We wanted this leaderboard to be a reflection of the combination of best stuff and pitchability.
Mikey Kroll (Bitzer 2027) posted an exceptional 8.7 Pitch Score on the heels of 3 above-average offerings (relative to age-average). Up North, Isaac Lockwood (Asnicar 2027) showed off some of the best stuff in the entire program on his way to posting an 8.1 Pitch Score during his bullpen. These are two names to know come August 1.
Average Fastball Velo Leaderboard
Keaton Maiorana (Duman 2026) has crept up into the low-90’s this summer.
Again, most guys only reach about 90% of their top-end stuff in bullpen environments. For many of these guys, they have shown more in competitive games.
Keaton Maiorana (Duman 2026) found himself near the top of this leaderboard after averaging 87.8 mph on his fastball during his session. Mikey Kroll (Bitzer 2027) topped this leaderboard as well at 90.4 mph. Isaac Lockwood (Asnicar 2027) led the way up North while averaging 84.9 mph during his session.
Average Slider Spin Leaderboard
Nick Dubofsky (Remy 2028) is shaping up to be a spin monster.
It’s pretty well-documented at this point that the two pillars of a good breaking ball are spin and velocity. Most effective high-level sliders are either high spin or high velocity. Some of the best are both.
Colton Lewis (Feinman 2027) can really spin it - there could be 3,000 rpm in there in the future a la Gavin Hasche. Nick Dubofsky (Remy 2028) impressively flirted with 2,700 rpm himself. Gavin Crino (Grammerstorf 2026) led the way down South with an average Slider spin up near 2,500.
Average Curveball Spin Leaderboard
Isaac Lockwood (Asnicar 2027) might have a 3,000 rpm banger curveball on his horizon.
Ditto on the curveball. Spin and firmness typically carry this pitch to effectiveness.
Along with some aforementioned names, Cole Bobbin (Bitzer 2027) - an infielder - makes an appearance on the leaderboard. Grant Snyder (McCann 2028) was dropping in hammers as well.
Engine Score Leaderboard (Pitchers Only)
You can read everything you need to know about Engine Score here. It’s a metric that we’ve created that factors in jump power and rotational power and is positively correlated to level of college commitment.
A couple of impressive arms that didn’t throw during eval days find themselves nestled up near the top in Dylan Langstaff and Ryan Neumann. Throw in Mikey Kroll and Bitzer 2027 has a three-headed monster that will be a treat to watch develop for the next year and a half. All the names on this list have D1 engines - what they do on the mound will determine how far they go.
Slammers Dashboard (For Players)
All results from evaluations (and past evaluations) will be accessible through the Slammers App. For years, we’ve been using these evaluations and the corresponding technology to objectively benchmark all of our athletes in areas that we know matter on the baseball field. Consistent tools and methods for measuring allows all of our players to track their progress, year-over-year.
Track progress, year-over-year.
Accessing Your Profile
To access your profile, click here: slammers.app; and proceed to log-in. For all first-time players or returning players who forgot their username and password, you can use the email address that received this communication to reset your password and access your account. You can always use this email address to reset your password and access your profile.
Please note: if mom and dad have both received this email, they can each create their own unique username and password to access their athlete’s profile.
Where to Find Eval Results
As I mentioned above, the results of the Loden evals will be found under the “Athlete” tab. For any returning players, your historical information is in there as well. Rapsodo data will be available under the “Hit” and “Pitch” tabs. For a quick refresher to help you understand what you’re looking at, check out this blog from last spring.
Percentile sliders to compare across all same-aged players in the program. A bunch of red sliders = this player is really good.
Slammers App
All of the functionality of the website: slammers.app – is now available in mobile app form. Go to either the iOS App Store or the Google Play store, search for “Slammers”, find the familiar “S”, and download the app on your phone. Use the same credentials you use online from your phone.