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7/06/23
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LHP/INF Colton Semmelmann (Brookfield Central, 2026), listed at 5-foot-10, 145 pounds, provided our staff another interesting look this past weekend in Waukesha. On the mound, the freshman displayed a quick and loose arm on a fastball that reached an 80.1 mph high, featuring arm-side life. His curveball has 2/8 shape with depth and a sharpness to it, and his feel to spin is advanced for his age, generating rates that exceed 2,400 rpm. Semmelmann’s slider had a similar shape to the curve, and had a max spin rate of 2,302 rpm. To round out his four-pitch arsenal, Semmelmann’s changeup flashed cutter movement and he was able to find it in and around the zone. At the plate, he showed a free and easy swing from the left side.
Body: 5-10, 145-pounds. Wiry frame with some projection.
Delivery: Drop and drive delivery, toe closed at landing.
Arm Action: LH. Quick arm, 3/4 slot.
FB: T80, 77-80 mph. Sinking action, firm. T2080, 2005 average rpm.
CB: 65-66 mph. 2/8 shape, tight break. T2410, 2323 average rpm.
SL: 64-66 mph. Similar feel as curveball, tighter spin. T2302, 2187 average rpm.
CH: 72-74 mph. Flashed cutter movement. T1784, 1687 average rpm.
Body: 5-10, 145-pounds. Wiry frame with some projection.
Hits: LHH. Narrower stock set up with relaxed hands. Easy, controlled move back, gets back to center, flat path on plane, free and easy, hitterish.
Power: 83 max exit velocity, averaged 71 MPH. 228' max distance.
Arm: LH. INF-80 mph.Short arc to 3/4 slot.
Defense: Feel around the bag, feet work.
Run: 8.21 runner in the 60.
Vizual Edge: 83 Edge Score
Semmelmann first caught our attention at The Rock during the Summer Championships. There the southpaw impressed with an athletic and repeatable delivery all while running his fastball to the upper 70’s and mixed in a steady amount of big 1/7 breaking balls that earned some awkward swings and misses. Although he isn’t on the initial rankings for this 2026 class, there is no reason why Semmelmann won’t make a big splash in later updates as he continues to develop.
A lanky 5-foot-8, 145-pound southpaw that was impressive for this GRB Rays MKE squad. Semmelmann is an athletic mover on the mound with a loose, whippy arm. He ran his fastball up to 78 mph and sat anywhere from 75-77 mph that played with some arm side run. He coupled this with a big 1/7 breaker that produced many swings and misses. An impressive outing from a young southpaw in Wisconsin’s ‘26 class and Semmelmann will be a name to closely monitor as he starts his prep career.