Washington Uncommitted Spotlight - '26 OF/LHP Dylan Mamiya
May 19, 2025
As the Washington high school baseball season continues, Prep Baseball features an Uncommitted Spotlight, where we highlight standout performers that attended a Prep Baseball Preseason ID event this year. Uncommitted spotlights are meant to showcase players that Prep Baseball Scouts felt showed standout tools, large improvements in overall game, or potential upside moving forward. College coaches and recruiters should be sure to keep an eye on these prospects in the coming months.
This week, we spotlight '26 OF/LHP Dylan Mamiya. The junior out of Kennewick High School was most recently seen at the Central Washington Preseason ID in Moses Lake this winter.
A twitchy athlete, Mamiya had a solid showcase in his most recent look, including exit velocities up to 99 MPH and a 6.84 60-yard dash time. Below is a complete breakdown of the player, including video and scouting reports from the event.
UPCOMING EVENTS
| SHOWCASE | STATE | DATE | LOCATION |
| Pacific Northwest Summer ID | WA | 05/25 | Ridgefield Recreation Complex - Ridgefield, WA |
| Spokane Summer ID | WA | 06/24 | Gonzaga University - Spokane, WA |
| Seattle Summer ID | WA | 06/26 | Island Crest Park - Mercer Island, WA |
| Seattle Summer ID - Session II | WA | 07/01 | Bannerwood Park - Bellevue, WA |
| Senior Future Games (Class of 2026) | NATIONAL | 07/22 | LakePoint Sports, Georgia |
| Future Games (Class of 2027) | NATIONAL | 07/23 | LakePoint Sports, Georgia |
| Junior Future Games (Class of 2029/2030) | NATIONAL | 07/24 | LakePoint Sports, Georgia |
| 2025 Pacific Northwest State Games (Invite-Only) | WA | 07/29 | Heritage High School - Vancouver, WA |
Scouting Report
Dylan Mamiya, Kennewick (WA), 2026
Positional Profile: OF/LHP
Body: 5-8, 178-pounds.
Delivery: Slight bend in rear knee, working from stretch position. Sets from 3B side of the rubber with hands at belt. Rides rear leg downhill with simple leg lift and drop. Head stays locked on target throughout. Controlled deceleration.
Arm Action: LH. Hands raise and break at the letters. Clean, quick arm action into 3/4 slot release. Some arm recoil on follow with tucked gloveside.
FB: T82, 82-82 mph. T2175, 2018 average rpm.
SL: 68-71 mph. T2223, 2181 average rpm.
SPLT: 71-73 mph.
ATH: 6.84 runner in the 60.
Dylan Mamiya, Kennewick (WA), 2026
Positional Profile: OF/LHP
Body: 5-8, 178-pounds.
Hit: LHH. Some bend in knees in balanced base at stance. Higher back elbow with knob pointed at catcher. Short stride load as hands retract slightly. Taller posture with uphill barrel path through the zone. Athletic movements with some twitch present. Extends to meet ball out front with firm front side at contact. Whippy one-hand finish. 66.7 mph bat speed with 8 G's of rotational acceleration.
Power: 99 max exit velocity, averaged 87.5 mph. 338' max distance.
Arm: LH. OF-83 mph. 3/4 slot release with tucked gloveside follow. Some cross-body action on the finish with body falling off to glove side post-release.
Defense: Ultra-quick first step, with athletic, quick bounce in step. Fields ball over lead gloveside leg with momentum carried through throws.
ATH: 6.84 runner in the 60.
Vizual Edge: 78.33 Edge Score
Dylan Mamiya, Kennewick (WA), 2026
Positional Profile: OF/LHP
Body: 5-9, 168-pounds.
Hit: LHH. Relaxed setup with weight loaded slightly over rear leg. Quiet hands stacked horizontally over rear shoulder. Controlled leg lift load with quiet hands and head. Works upward through zone with some classic LH loft in swing. Bend in levers and extends to meet ball out front, rotating quickly. Repeatable 1H finish. 66.2 mph bat speed with 7 G's of rotational acceleration.
Power: 91 max exit velocity, averaged 84.3 mph. 335' max distance.
Arm: LH. OF-84 mph. High intent, high 3/4 slot release with cross-body action. Easy arm strength.
Defense: Quick feet, attacks ball to work through throws. Consistently fields ball over gloveside leg. Momentum carried through throws.
ATH: 6.95 runner in the 60. 29.90 max vertical.