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Jonah Heim

Born: 06/27/1995 (Age: 19)
Bats: Switch Throws: Right
Height: 6' 4" Weight: 225
Primary Position: C
Physical/Health
Very tall and wiry frame; extremely projectable; flexible frame and able to get low enough while catching; able to put on more muscle/weight because speed is already not an impact tool.
Evaluator Tucker Blair
Report Date 09/05/2014
Dates Seen 6/27 - 6/29, 8/23, 8/24, 8/31, 9/1
Affiliate Aberdeen IronBirds (Short Season, Orioles)
Makeup

Excellent makeup; hard worker; absorbs coaching; works well with pitching staff; shows a swagger; takes control of the game behind the plate.

MLB ETA Risk Factor OFP Realistic Role Video
2018 High 50 30; Organizational Player No
Tool Future Grade Report
Hit 30 Switch hitter but replicates a consistent-styled swing well from both sides; above-average bat speed; slight hitch in first viewing; lessened in next viewing; good extension with hands; sometimes will drift hands and causes him to drop hands and back shoulder; moderate load; can become unbalanced at times due to timing issues; uses hips well to provide torque; steps in the bucket sometimes on the good soft stuff; below-average pitch recognition currently; has improved over the season and looks more relaxed at the plate; approach is growing as he plays deeper into his professional career.
Power 50 Plus raw power from both sides; loft in swing; above-average bat speed; inconsistency with hit tool like plays down in-game ability.
Baserunning/Speed 30 4.55 from right side; 4.49 from left side; well below-average runner; runs like a catcher; not a good first or second gear.
Glove 60 Plays well behind the plate already; strong wrists and hands allow him to provide an excellent target and frame pitches; moves and shuffles well behind the plate for his lack of speed; able to maneuver horizontally at an above-average rate; footwork is strong; able to receive and set himself up for throws; able to get low and provide the lower quadrant target; can still improve his blocking skills on sliders.
Arm 60 Plus arm strength; pop times currently 1.90 - 1.94; recorded a 1.97 pop time from his knees; able to fire lines to 2B; ball will occasionally tail some; accuracy not always there but has gradually improved over season; arm could grow stronger with potentially muscle; fast-twitch throwing motion.
Overall

Heim is an extremely raw prospect, but has an above-average defense and arm already. The hitting is well behind the defense, but he has shown mild improvements throughout the entire season. Heim has slowly improved over the year and his excellent makeup is a large reason why. He displayed a slight hitch from both sides, but has decreased this some. His hands were too high one game, too low the next, and then he was able to find a balanced location that provided a better path to the ball. He is able to take coaching and learn quickly.

I question whether he can make enough contact to consistently provide value as a starter, but Heim has all the tools to at least be a backup at the highest level. He needs to be taken along slowly, but the tools are all evident.

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