Rank History
| Year | Team | Position | Team Rank | OFP |
|---|---|---|---|---|
| 2021 | ARI | RHP | 8 | 50 |
Grades Update: Dec 2020
| OFP | Role | FB | CB | SL | CH | Cnt/Cmd |
|---|---|---|---|---|---|---|
| 50 | 50 | 60 | 50 | 55 | 50 | 45/40 |
Dec 2020 Report
Evaluator: Matt Thompson
Age: 23 yr
Height: 6-0
Weight: 165 lbs
Hits/Throws: R/R
Acquired: 2019 CBA Round 1
RuleV: 2022
Physical Description: Short stature, small legs. Thin, likely shorter than listed 6'0" height. Likely also ten or so pounds heavier than his listed 165. Impressive athlete that will put in the work and study film.
Delivery & Mechanics: High effort delivery that Jameson repeats well. Starts squared to home plate, comes set high. The arm and hips do most of the work here, as he does a tremendous job incorporating his lower half and drives directly over plant leg. Double-plus arm speed. Has tightened up his delivery since Ball State days and has become more efficient. Has eliminated some inefficient movements and become more streamlined towards the plate. Everything is working as one. Velocity took a jump after improving delivery. Still has some significant head movement during the delivery though that will affect his command.
Fastball: Jameson was 92-95 and touched 96 in college when members of our team saw him in Arizona, and he lived up in the zone with the pitch. Since changing his delivery a bit from video I was able to find from instructional league the fastball has jumped. He's sitting 96-98 and I've seen as high as 99, supposedly he's hit 100 but I can't verify that. That could be slightly a product of working in smaller bursts, so that could be what's going on here. Need more info to verify. He's had no issues with holding velocity late in games while at Ball St. This is a big pitch. It's double-plus with improved command. Grade: 60
Curveball: His curveball would blend with his slider at times, but when its working well it has 11-to-5 break. He's supposedly altered his grip on his curve during the shutdown to get it to separate from his slider. Make it consistently its own pitch. Grade: 50
Slider: Slider generates whiffs at a high rate. Has that Diamondbacks signature, the plus horizontal movement, but will also show nice vertical depth. Pitch is his go to swing and miss pitch against same sided hitters. Above-average now, chance at plus down the line. Grade: 55
Changeup: I really like his changeup, he pronates well and it has two-seam movement. Its a firm pitch, coming in around 89-91, but he just doesn't throw it enough. If he mixes it in more I'll call it a plus pitch. For now it's just average. Grade: 50
Control and Command: Had some mechanical concerns which made it difficult to throw strikes while at Hillsboro, and while he's put in the work to make adjustments we haven't seen him in game action since. The delivery is better, but there still is significant head movement. Control: 45 | Command: 40
Overall: Jameson is an explosive arm that fits in extremely well for the modern game. He's very intelligent and know what he needs to do to improve, and takes to instruction well. I'd continue to push him as a starter as long as I could, knowing that the loud stuff will play in any role. He can be an impact arm in whatever his future role is, why not just let him pitch more often then.
OFP: 50
Role: 50 - #4-5 Backend Starter/Average High Leverage Relief
Risk: High
