Jack Postma
RHP / 1B · Class of 2028 · Barrington (IL) · 6'5" 200 · R/R · 16y 8mo · GRB Illinois · UNCOMMITTED · PBR 2028 National #66 (#8 RHP) · IL #3 (#2 RHP) · PG 2028 #82 (9/2 — up from #261 in July)
UVA Recruiting
Pitching Report
PBR Future Games (Class of 2028) · Emerson, GA · July 22, 2026 · TrackMan · PBR All-American Game participant (8/7)
92.4
FB Max
90–92
FB Sitting
13.5"
FB Ride Avg
7.0'
Extension
2309
CB Spin
Benchmarks — vs. typical 2028 showcase arm
Gray band = typical class range (approx.) · marker = Postma
FB Velo Max
92.4
FB Velo Sitting
90–92
FB Spin Max
2412
FB Ride (IVB)
13.5"
CB Spin Max
2309
Extension
7.0'
Spring Development — Feb 28 → Jul 22
Preseason All-State vs. Future Games · FB max was 84.4 in Aug '25 (+8.0 in 12 mo)
MetricAll-State 2/28Future GamesΔ
FB sitting89.0–90.789.8–91.9+1.2
FB max91.392.4+1.1
FB ride (IVB)11.2"13.5"+2.3"
FB spin avg20982288+190
Extension5.8'7.0'+1.2'
Breaker (SL→CB)72.6–76.777.9+0.7 velo
The extension jump is the story — 5.8' to a legit 7.0' off a 6'5" frame, so the 90–92 plays up beyond the gun reading. Ride climbed with it (+2.3"), and the breaker firmed from a mid-70s slider into a 78-mph sweeper he landed for a strike every time TrackMan saw it.
Pitch Metrics — Future Games (SL from 2/28)
PitchRangeMaxSpinIVBHMNote
Fastball 89.8–91.992.4228813.5"13.6"RIDE+RUN
Curveball 77.977.923095.4"−11.2"SWEEPER
Changeup 79.3–80.280.219062.7"15.2"FADES
Slider 2/28 72.6–76.777.219125.6"−13.6"BLENDS W/ CB
Ext 7.0' · Release 4.8' — long levers, low-ish slot, and the ball gets on hitters · the CB/SL read as one horizontal sweeper (positive IVB, 11–14" of sweep) · also ran a sinker 89–91 in Feb
Movement
FB rides and runs in equal parts — the sweeper mirrors it 14 mph slower with pure left/right break, and the CH tucks under the FB's run · hollow dot: the Feb slider, now folded into the sweeper
12"24"RiseDropGloveArmFBCHCBSL 2/28
Source: Prep Baseball Report profile · Future Games TrackMan (7/22/26), Preseason All-State (2/28/26), IL State Games (8/5/25), Junior Future Games (7/24/24) · PG rank from 9/2/26 top-500 list · Class benchmark bands are staff approximations · Prepared by UVA Pitching · 9/7/26