P | Arizona Diamondbacks
Bats/Throws: R/R | 6' 0" 165 lbs | Age: 28
Draft: 2019 | Rd. 1C, No. 34, Arizona Diamondbacks | Ball State
W L ERA G GS SV IP SO WHIP
2023 3 1 3.32 15 3 1 40.2 37 1.43
2025 0 1 3.00 3 0 1 3 0 2.33
2026 0 0 4.67 11 0 0 17.1 13 1.44
4 Seasons 6 2 3.06 33 7 2 85.1 74 1.37
G W-L ERA IP SO WHIP
2023 15 3-1 3.32 40.2 37 1.43
2025 3 0-1 3.00 3 0 2.33
2026 11 0-0 4.67 17.1 13 1.44
4 Seasons 33 6-2 3.06 85.1 74 1.37
Player Apps
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Pitch Usage
MLB Percentile Rankings
Movement Profile (Induced Break)
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Statcast Statistics

Season Age Pitches Batted
Balls		 Barrels Barrel % Barrel/PA Exit
Velocity		 Max EV Launch
Angle		 LA Sweet-
Spot %		 xBA xSLG wOBA xwOBA xwOBAcon HardHit% K% BB% ERA xERA
2022 24 369 66 5 7.6 5.1 88.9 107.9 3.2 30.3 .265 .430 .277 .331 .408 48.5 24.5 7.1 1.48 4.52
2023 25 674 118 16 13.6 9.2 92.0 113.8 11.9 33.9 .249 .506 .330 .356 .412 47.5 21.3 10.3 3.32 5.52
2025 27 53 10 0 0.0 0.0 89.7 112.0 6.0 50.0 .397 .531 .488 .470 .403 40.0 0.0 23.1 3.00 11.06
2026 28 266 53 3 5.7 3.9 86.4 105.3 13.3 37.7 .250 .369 .318 .322 .330 28.3 17.1 11.8 4.67 4.37
Player 1362 247 24 9.7 6.6 89.9 113.8 9.6 34.4 .258 .457 .319 .346 .393 43.3 20.5 10.2
MLB 7.6 4.9 88.6 122.9 12.5 33.3 .243 .407 .316 .316 .369 37.1 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Jameson relies on 5 pitches.
Slider
(34.2%) ,
Changeup
(19.9%) ,
Four Seamer
(19.2%) ,
Sinker
(19.2%) ,
Sweeper
(7.5%) ,


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Pitch Tracking



Batted Ball Profile

AIR: Fly Balls + Line Drives + Popups All Batted Balls Batted Ball Breakdown
Season GB % AIR % FB % LD % PU % Pull % Straight % Oppo % Pull GB % Straight GB % Oppo GB % Pull AIR % Straight AIR % Oppo AIR %
2022 56.1 43.9 18.2 24.2 1.5 42.4 36.4 21.2 24.2 19.7 12.1 18.2 16.7 9.1
2023 46.6 53.4 32.2 17.8 3.4 33.1 39.0 28.0 16.9 21.2 8.5 16.1 17.8 19.5
2025 40.0 60.0 10.0 50.0 0.0 10.0 70.0 20.0 0.0 30.0 10.0 10.0 40.0 10.0
2026 37.7 62.3 24.5 34.0 3.8 43.4 37.7 18.9 17.0 15.1 5.7 26.4 22.6 13.2
Player 47.0 53.0 25.9 24.3 2.8 36.8 39.3 23.9 18.2 19.8 8.9 18.6 19.4 15.0
MLB 44.1 55.9 24.2 24.6 7.1 37.5 37.3 25.1 20.7 17.6 5.8 16.8 19.7 19.2
! Note: All figures in this table cover the period 2015-present.

Quality of Contact

Season Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2022 7.6 42.4 12.1 27.3 3.0 7.6 5.1
2023 1.7 38.1 23.7 16.9 5.9 13.6 9.2
2025 10.0 20.0 10.0 40.0 20.0 0.0 0.0
2026 3.8 28.3 30.2 28.3 3.8 5.7 3.9
Player 4.0 36.4 21.5 23.1 5.3 9.7 6.6
MLB 4.0 32.3 25.0 24.4 5.9 7.6 4.9
! Note: All figures in this table cover the period 2015-present.

Pitch Movement

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How this works: This section shows two different ways to evaluate pitch movement. On the left, “Total Movement” shows the real-world movement of a pitch, including the forces of gravity, which affects every pitch thrown. Since gravity requires time, and slower pitches aren't 'better' just because they have more time to move, a pitch's movement is compared to other pitches of the same pitch type, within +/- 2 MPH and +/- 0.5 feet of extension/release. On the right, Induced Movement (or IVB) is reported without gravity, and attempts to isolate movement created by the pitcher's ability to spin and manipulate the ball.
Total Movement (in inches, w/ gravity)Induced Movement (in inches, w/o gravity)
YearPitchTeamHand#MPHVertical
Drop		vs.
Comparable		Horizontal
Break		vs.
Comparable		Vertical
Break		vs. AvgHorizontal
Break		vs. Avg
2026 4-Seam Fastball AZ R 51 96.5 12.9 1.7 10.0ARM 1.3 16.6 0.9 10.0ARM 2.2
2026 Changeup AZ R 53 89.4 30.4 -1.3 16.7ARM 1.4 3.9 0.0 16.7ARM 2.4
2026 Sweeper AZ R 20 82.8 39.3 -0.6 12.9GLV -0.9 0.5 0.5 12.9GLV -0.8
2026 Slider AZ R 91 86.9 32.7 -2.5 2.3GLV -0.2 3.4 -2.0 2.3GLV -1.4
2026 Sinker AZ R 51 95.6 18.9 -4.4 14.6ARM -1.7 11.1 -3.5 14.6ARM -0.5
2025 4-Seam Fastball AZ R 10 98.3 14.1 0.0 7.6ARM -1.4 14.3 -1.5 7.6ARM 0.0
2025 Changeup AZ R 13 90.2 30.9 -0.1 16.1ARM 0.6 2.8 1.3 16.1ARM 1.6
2025 Sinker AZ R 16 96.5 23.9 1.0 17.2ARM 0.8 5.6 1.8 17.2ARM 2.1
2025 Slider AZ R 14 87.6 34.3 0.0 3.2GLV 0.1 1.7 0.1 3.2GLV -1.0
! Note: Years are in reverse order.

Run Values by Pitch Type

Year Pitch Type Team RV/100 Run Value Pitches % PA BA SLG wOBA Whiff% K% PutAway % xBA xSLG xwOBA Hard Hit %
2026 Slider 0.8 1 91 34.2 28 .308 .462 .359 43.2 28.6 32.0 .266 .387 .308 22.2
2026 Changeup -0.8 0 53 19.9 16 .267 .333 .291 33.3 12.5 11.1 .256 .283 .267 15.4
2026 4-Seam Fastball -3.2 -2 51 19.2 12 .250 .625 .471 22.2 16.7 16.7 .232 .577 .458 33.3
2026 Sinker 3.9 2 51 19.2 13 .167 .167 .192 8.3 0.0 0.0 .306 .394 .331 41.7
2026 Sweeper 1.3 0 20 7.5 7 .000 .000 .200 14.3 14.3 16.7 .043 .145 .254 50.0
2025 Sinker -1.0 0 16 30.2 3 .333 .333 .300 16.7 0.0 -- .178 .367 .227 33.3
2025 Slider -2.3 0 14 26.4 3 .000 .000 .467 50.0 0.0 0.0 .008 .017 .470 100.0
2025 Changeup 3.4 0 13 24.5 2 .000 .000 .000 20.0 0.0 0.0 .322 .330 .291 0.0
2025 4-Seam Fastball -20.3 -2 10 18.9 5 .750 1.250 .820 0.0 0.0 0.0 .696 .883 .692 50.0
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.

Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2026 Changeup 53 89.4 92 17.8 2:00 2:45 -45
2026 4-Seam Fastball 51 96.5 97 19.2 1:15 1:00 15
2026 Sinker 51 95.6 96 18.4 1:30 2:00 -30
2026 Slider 91 86.9 15 4.6 10:15 10:15 0
2026 Sweeper 20 82.8 39 13.9 7:45 8:45 -60
2025 Changeup 13 90.2 85 17.1 2:00 2:45 -45
2025 4-Seam Fastball 10 98.3 91 15.9 1:00 1:00 0
2025 Sinker 16 96.5 89 18.8 1:45 2:30 -45
2025 Slider 14 87.6 16 4.4 8:00 9:00 -60
! Note: Years are in reverse order.
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! Note: This table is showing data from the PITCHER perspective.
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Pitcher Arm Angle

! Note: Data is available from 2020 through the present.
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Statcast Pitching Run Value

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2022 98 369 3 2 -2 -1 3
2023 174 674 4 0 -5 -2 -3
2025 13 53 0 -1 -1 0 -2
2026 76 266 3 1 -1 -2 1
Player 361 1,362 11 2 -8 11 -1
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Plate Discipline

Season Pitches Zone % Zone Swing % Zone Contact % Chase % Chase Contact % Edge % 1st Pitch Strike % Swing % Whiff % Meatball % Meatball Swing %
2022 369 56.6 66.5 80.6 25.6 48.8 45.8 58.2 48.8 26.7 9.2 85.3
2023 674 50.4 61.2 81.7 30.5 46.1 44.5 52.9 46.0 30.0 7.1 62.5
2025 53 39.6 71.4 93.3 15.6 40.0 43.4 61.5 37.7 20.0 1.9 0.0
2026 266 48.9 63.8 80.7 29.4 50.0 35.7 63.2 46.2 29.3 7.5 65.0
Player 1,362 51.4 63.6 81.6 28.4 47.3 43.1 56.8 46.5 28.6 7.6 69.9
MLB 48.7 67.0 82.6 28.6 57.9 42.6 61.2 47.3 25.0 7.3 76.2
! Note: All figures in this table cover the period 2015-present.

Percentile Rankings

Run Value Pitching
Year Pitching Fastball Breaking Off
Speed 		xERA Fastball
MPH 		Fastball
Spin 		Curve
Spin 		Avg
EV 		Chase% Whiff% K% BB% Barrel% Hard-
Hit% 		GB% Extension
2022 72 34 6
2023 83 34 3
2025
2026 77 59 4
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Expected Home Runs

Adjusted
Year Team Avg HR Trot Actual HR xHR HR-xHR Doubters Mostly Gone No Doubters No Doubter %
2022 23.47 2 1.8 0 1 2 0 0.0
2023 23.11 6 6.5 -1 2 3 4 66.7
2026 24.29 1 1.4 0 0 1 1 100.0
Player 23.32 9 9.7 -1 3 6 5 55.6
Note: xHR tells how many of this pitcher's batted balls allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Expected Home Runs by Park

Adjusted
Year HR
2022 2 2 2 3 2 2 2 1 1 1 1 2 2 2 2 2 1 2 2 2 2 2 2 2 1 1 2 2 2 2 1
2023 6 6 6 7 6 6 6 6 6 6 6 8 7 7 7 6 7 6 7 7 7 7 8 8 6 6 6 6 7 6 5
2026 1 2 1 1 1 1 1 1 1 1 1 1 2 2 1 1 2 1 1 1 2 2 2 2 2 1 1 2 2 1 2
Player 9 10 9 11 9 9 9 8 8 8 8 11 11 11 10 9 10 9 10 10 11 11 12 12 9 8 9 10 11 9 8
Note: xHR tells how many of this pitcher's batted balls allowed would have been out of other stadiums. The "Adjusted" view here accounts for different wall heights, distances and environmental effects using Statcast Park Factor data.
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Year to Year Changes

2026 +/-   2025 +/-   2024 +/-   2023 +/-   2022
Results
BA .242 -.158 ↓ .400 -- -- -- -- +.038 ↑ .222
xBA .250 -.147 ↓ .397 -- -- -- -- -.016 ↓ .265
OBP .342 -.196 ↓ .538 -- -- -- -- +.053 ↑ .286
xOBP .349 -.187 ↓ .536 -- -- -- -- +.004 ↑ .325
SLG .364 -.236 ↓ .600 -- -- -- -- +.083 ↑ .333
xSLG .369 -.162 ↓ .531 -- -- -- -- +.076 ↑ .430
ISO .121 -.079 ↓ .200 -- -- -- -- +.045 ↑ .111
xISO .119 -.015 ↓ .134 -- -- -- -- +.092 ↑ .165
BABIP .288 -.112 ↓ .400 -- -- -- -- +.023 ↑ .281
wOBA .318 -.170 ↓ .488 -- -- -- -- +.053 ↑ .277
xwOBA .322 -.148 ↓ .470 -- -- -- -- +.025 ↑ .331
wOBAcon .324 -.103 ↓ .427 -- -- -- -- +.048 ↑ .327
xwOBAcon .330 -.073 ↓ .403 -- -- -- -- +.004 ↑ .408
BACON .302 -.098 ↓ .400 -- -- -- -- +.036 ↑ .303
xBACON .312 -.085 ↓ .397 -- -- -- -- -.036 ↓ .361
Statcast Hit Metrics
Hard Hit % 28.3 -11.7 ↓ 40.0 -- -- -- -- -1.0 ↓ 48.5
Avg Exit Velocity 86.4 -3.3 ↓ 89.7 -- -- -- -- +3.1 ↑ 88.9
Launch Angle Sweet-Spot % 37.7 -12.3 ↓ 50.0 -- -- -- -- +3.6 ↑ 30.3
Barrel % 5.7 +5.7 ↑ 0.0 -- -- -- -- +6.0 ↑ 7.6
Avg Launch Angle 13.3 +7.3 ↑ 6.0 -- -- -- -- +8.7 ↑ 3.2
Statcast Bat Tracking
Bat Speed 71.9 +0.1 ↑ 71.8 -- -- -- -- -- --
Attack Angle 12° +3° ↑ 9° -- -- -- -- -- --
Ideal Attack Angle % 52.6 +15.1 ↑ 37.5 -- -- -- -- -- --
Attack Direction -7° -7° ↓ 0° -- -- -- -- -- --
Swing Path - Tilt 32° -1° ↓ 33° -- -- -- -- -- --
Swing Length 7.5 +0.4 ↑ 7.1 -- -- -- -- -- --
Statcast Pitch Metrics
Fastball Velocity 96.1 -1.1 ↓ 97.2 -- -- -- -- +0.7 ↑ 95.2
Breaking Velocity 86.2 -1.4 ↓ 87.6 -- -- -- -- +1.3 ↑ 83.5
Offspeed Velocity 89.4 -0.8 ↓ 90.2 -- -- -- -- +2.8 ↑ 86.3
Batted Ball Results
Barrels 3 +3 ↑ 0 -- -- -- -- +11 ↑ 5
Popup % 3.8 +3.8 ↑ 0.0 -- -- -- -- +1.9 ↑ 1.5
Flyball % 24.5 +14.5 ↑ 10.0 -- -- -- -- +14.0 ↑ 18.2
Line Drive % 34.0 -16.0 ↓ 50.0 -- -- -- -- -6.4 ↓ 24.2
Groundball % 37.7 -2.3 ↓ 40.0 -- -- -- -- -9.5 ↓ 56.1
Pull % 43.4 +33.4 ↑ 10.0 -- -- -- -- -9.3 ↓ 42.4
Straight Away % 37.7 -32.3 ↓ 70.0 -- -- -- -- +2.6 ↑ 36.4
Opposite Field % 18.9 -1.1 ↓ 20.0 -- -- -- -- +6.8 ↑ 21.2
Weak Contact % 3.8 -6.2 ↓ 10.0 -- -- -- -- -5.9 ↓ 7.6
Pull Airball % 26.4 +16.4 ↑ 10.0 -- -- -- -- -2.1 ↓ 18.2
Topped Contact % 28.3 +8.3 ↑ 20.0 -- -- -- -- -4.3 ↓ 42.4
Under Contact % 30.2 +20.2 ↑ 10.0 -- -- -- -- +11.6 ↑ 12.1
Flare/Burner Contact % 28.3 -11.7 ↓ 40.0 -- -- -- -- -10.4 ↓ 27.3
Solid Contact % 3.8 -16.2 ↓ 20.0 -- -- -- -- +2.9 ↑ 3.0
HR/FB % 7.7 +7.7 ↑ 0.0 -- -- -- -- -0.9 ↓ 16.7
Popups 2 +2 ↑ 0 -- -- -- -- +3 ↑ 1
Flyballs 13 +12 ↑ 1 -- -- -- -- +26 ↑ 12
Line Drives 18 +13 ↑ 5 -- -- -- -- +5 ↑ 16
Groundballs 20 +16 ↑ 4 -- -- -- -- +18 ↑ 37
Plate Discipline
In Zone % 48.9 +9.3 ↑ 39.6 -- -- -- -- -6.2 ↓ 56.6
Out of Zone % 51.1 -9.3 ↓ 60.4 -- -- -- -- +6.2 ↑ 43.4
Edge % 35.7 -7.7 ↓ 43.4 -- -- -- -- -1.3 ↓ 45.8
Zone Swing % 63.8 -7.6 ↓ 71.4 -- -- -- -- -5.3 ↓ 66.5
Out of Zone Swing % 29.4 +13.8 ↑ 15.6 -- -- -- -- +4.9 ↑ 25.6
In Zone Contact % 80.7 -12.6 ↓ 93.3 -- -- -- -- +1.1 ↑ 80.6
Out of Zone Contact % 50.0 +10.0 ↑ 40.0 -- -- -- -- -2.7 ↓ 48.8
Whiff % 29.3 +9.3 ↑ 20.0 -- -- -- -- +3.3 ↑ 26.7
First Strike % 63.2 +1.7 ↑ 61.5 -- -- -- -- -5.3 ↓ 58.2
First Pitch Swing % 34.2 -4.3 ↓ 38.5 -- -- -- -- -5.9 ↓ 30.6
Swing % 46.2 +8.5 ↑ 37.7 -- -- -- -- -2.8 ↓ 48.8
Meatball Swing % 65.0 +65.0 ↑ 0.0 -- -- -- -- -22.8 ↓ 85.3
Meatball % 7.5 +5.6 ↑ 1.9 -- -- -- -- -2.1 ↓ 9.2
Zone Swing & Miss % 19.3 +12.6 ↑ 6.7 -- -- -- -- -1.1 ↓ 19.4
Out of Zone Swing & Miss % 50.0 -10.0 ↓ 60.0 -- -- -- -- +2.7 ↑ 51.2
In Zone 130 +109 ↑ 21 -- -- -- -- +131 ↑ 209
Out of Zone 136 +104 ↑ 32 -- -- -- -- +174 ↑ 160
Edge 95 +72 ↑ 23 -- -- -- -- +131 ↑ 169
In Zone Swings 83 +68 ↑ 15 -- -- -- -- +69 ↑ 139
Out of Zone Swings 40 +35 ↑ 5 -- -- -- -- +61 ↑ 41
In Zone Swing & Misses 16 +15 ↑ 1 -- -- -- -- +11 ↑ 27
Out of Zone Swing & Misses 20 +17 ↑ 3 -- -- -- -- +34 ↑ 21
Basic
Pitches 266 +213 ↑ 53 -- -- -- -- +305 ↑ 369
PA 76 +63 ↑ 13 -- -- -- -- +76 ↑ 98
AB 66 +56 ↑ 10 -- -- -- -- +64 ↑ 90
Hits 16 +12 ↑ 4 -- -- -- -- +20 ↑ 20
Singles 11 +9 ↑ 2 -- -- -- -- +14 ↑ 14
Doubles 3 +1 ↑ 2 -- -- -- -- +2 ↑ 4
Triples 1 +1 ↑ 0 -- -- -- -- 0 0
Home Runs 1 +1 ↑ 0 -- -- -- -- +4 ↑ 2
Walks 9 +6 ↑ 3 -- -- -- -- +11 ↑ 7
Strikeouts 13 +13 ↑ 0 -- -- -- -- +13 ↑ 24
K% 17.1 +17.1 ↑ 0.0 -- -- -- -- -3.2 ↓ 24.5
BB% 11.8 -11.3 ↓ 23.1 -- -- -- -- +3.2 ↑ 7.1
HBP 1 +1 ↑ 0 -- -- -- -- 0 1
Batted Balls 53 +43 ↑ 10 -- -- -- -- +52 ↑ 66
Fastball Percent 38.3 -10.8 ↓ 49.1 -- -- -- -- -5.3 ↓ 62.3
Offspeed Percent 19.9 -4.6 ↓ 24.5 -- -- -- -- +4.8 ↑ 8.4
Breaking Percent 41.7 +15.3 ↑ 26.4 -- -- -- -- +0.5 ↑ 29.3
Number of Fastballs 102 +76 ↑ 26 -- -- -- -- +154 ↑ 230
Number of Offspeed 53 +40 ↑ 13 -- -- -- -- +58 ↑ 31
Number of Breaking 111 +97 ↑ 14 -- -- -- -- +93 ↑ 108
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2022 Shifts 98 .277 46 3 6.5 52 34 65.4
2023 Shades 174 .330 91 1 1.1 83 40 48.2
2025 Shades 13 .488 5 1 20.0 8 2 25.0
2026 Shades 76 .318 34 1 2.9 42 11 26.2
! Note: Shifts are through the 2022 season, Shaded starting from the 2023 season, Shift: three or more infielders are on the same side of second base, Shade: positioned outside of their typical responsible slices of the field.
Learn more about how positioning is defined here

Pitch Tempo

Bases EmptyRunners On Base
SeasonTeamPitchesTempoFast %Slow %PitchesTempoFast %Slow %
2022 123 16.5 17.9% 0.0% 45 22.6 0.0% 4.4%
2023 203 15.0 49.3% 0.5% 118 19.8 0.0% 0.0%
2025 10 16.1 30.0% 0.0% 17 19.6 0.0% 0.0%
2026 57 16.1 31.6% 3.5% 31 20.2 0.0% 0.0%

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Pitch Distribution

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