George Kirby
P | Bats/Throws: R/R | 6' 4" 215LBS | Age: 26
Draft: 2019 | Rd: 1, #20, Seattle Mariners | Elon University
W L ERA G GS SV IP SO WHIP
2022 8 5 3.39 25 25 0 130 133 1.21
2023 13 10 3.35 31 31 0 190.2 172 1.04
2024 11 10 3.61 29 29 0 167 162 1.11
3 Seasons 32 25 3.45 85 85 0 487.2 467 1.11
G W-L ERA IP SO WHIP
2022 25 8-5 3.39 130 133 1.21
2023 31 13-10 3.35 190.2 172 1.04
2024 29 11-10 3.61 167 162 1.11
3 Seasons 85 32-25 3.45 487.2 467 1.11
MLB Percentile Rankings
Pitch Distribution
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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 2092 382 34 8.9 6.3 89.3 111.5 11.3 31.4 .233 .379 .302 .284 .354 38.7 24.5 4.1 3.39 3.31
2023 25 2825 560 42 7.5 5.5 89.2 115.6 12.4 32.0 .262 .425 .284 .305 .382 40.9 22.7 2.5 3.35 3.90
2024 26 2604 499 43 8.6 6.2 89.1 113.9 15.1 31.3 .241 .411 .294 .294 .368 36.9 23.5 3.0 3.61 3.51
Player 7521 1441 119 8.3 6.0 89.2 115.6 13.0 31.6 .247 .408 .293 .295 .370 38.9 23.5 3.1
MLB 7.0 4.8 88.5 122.4 12.3 33.2 .245 .406 .316 .315 .369 36.5 22.2 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Kirby relies on 7 pitches.
Four Seamer
(33.4%) ,
Sinker
(23.6%) ,
Slider
(23.3%) ,
Split Finger
(10.7%) ,
Knuckle Curve
(8.4%) ,
Cutter
(0.4%) ,
Knuckleball
(0.0%) ,


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Pitch Tracking



Batted Ball Profile

Season GB % FB % LD % PU % Pull % Straight % Oppo % Weak % Topped % Under % Flare/Burner % Solid % Barrel % Barrel/PA
2022 46.3 25.7 21.2 6.8 31.4 40.3 28.3 3.1 35.3 24.1 22.3 5.8 8.9 6.3
2023 44.6 25.7 22.1 7.5 38.2 31.4 30.4 2.3 34.5 24.3 25.5 5.9 7.5 5.5
2024 42.1 26.7 22.0 9.2 33.7 37.5 28.9 3.4 32.1 27.7 22.2 5.8 8.6 6.2
Player 44.2 26.0 21.9 7.9 34.8 35.9 29.3 2.9 33.9 25.4 23.5 5.8 8.3 6.0
MLB 44.5 23.7 24.7 7.1 37.2 37.5 25.2 3.9 32.7 24.8 24.4 5.9 7.0 4.8
! Note: All figures in this table cover the period 2015-present.

Pitch Movement

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How this works: Every pitch is affected by the forces of gravity, which means that every pitch drops on its way from the mound to the plate. These numbers are reported with gravity, which makes them larger and different than other pitch movement numbers you may have seen. Since gravity requires time, and slower pitches aren’t ‘better’ just because they have more time to move, the movement of a pitch is compared to ‘average’ movement by comparing it to other MLB pitch types within +/- 2 MPH and from within +/- 0.5 feet of extension and release.
Vertical Movement (inches) Horizontal Movement (inches)
Year Pitch Team Hand # MPH Inches of Drop vs Avg % vs Avg Inches of Break vs Avg % Break vs Avg
2024 Slider SEA R 608 87.2 38.3 4.4 13 7.4 3.2 76
2024 Sinker SEA R 614 96.0 18.2 -2.5 -12 15.8 0.9 6
2024 Split-Finger SEA R 279 85.9 35.9 2.5 7 9.5 -1.1 -10
2024 Cutter SEA R 11 92.3 23.6 -0.6 -3 1.0 -1.2 -55
2024 4-Seam Fastball SEA R 871 95.9 13.9 -0.1 -1 9.3 1.8 25
2024 Curveball SEA R 220 83.4 53.6 5.6 12 8.5 1.0 13
2023 Changeup SEA R 51 86.6 31.3 0.5 2 16.0 1.6 11
2023 4-Seam Fastball SEA R 1,112 96.1 14.4 -0.5 -4 8.3 0.6 8
2023 Split-Finger SEA R 171 84.9 37.5 3.6 11 10.3 -1.0 -9
2023 Sinker SEA R 609 95.8 19.4 -1.0 -5 15.8 0.7 5
2023 Slider SEA R 556 86.3 39.2 4.2 12 11.0 6.4 141
2023 Curveball SEA R 324 81.8 53.9 3.8 8 9.2 1.0 13
2022 Curveball SEA R 278 80.8 53.6 2.5 5 9.9 1.0 11
2022 Sinker SEA R 255 94.7 20.6 -0.1 -1 16.2 1.2 8
2022 Cutter SEA R 255 88.3 30.2 -2.9 -11 3.8 1.2 48
2022 Changeup SEA R 167 86.0 33.5 2.5 8 15.3 0.8 6
2022 4-Seam Fastball SEA R 950 95.3 15.1 -1.1 -8 8.8 1.3 17
2022 Slider SEA R 187 85.5 38.1 2.5 7 10.1 5.2 106
! Note: Years are in reverse order.
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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 %
2024 4-Seam Fastball 1.0 8 871 33.4 238 .236 .484 .320 29.2 31.5 23.1 .231 .469 .309 40.5
2024 Sinker 1.0 6 614 23.6 182 .264 .345 .297 11.7 12.6 14.0 .268 .378 .296 39.1
2024 Slider 1.0 6 608 23.3 140 .246 .351 .275 26.6 23.6 24.1 .247 .423 .304 31.1
2024 Split-Finger -1.4 -4 279 10.7 74 .235 .382 .307 28.0 23.0 13.9 .227 .375 .287 32.1
2024 Curveball -2.4 -5 220 8.4 53 .314 .431 .356 30.8 24.5 13.3 .207 .294 .233 36.8
2024 Cutter 0.9 0 11 0.4 1 .000 .000 .000 0.0 0.0 0.0 .049 .082 .059 0.0
2024 Knuckleball -3.3 0 1 0.0 -- -- -- -- -- -- -- -- -- --
2023 4-Seam Fastball 1.3 14 1,112 39.4 306 .234 .392 .288 28.0 28.4 21.7 .248 .435 .306 43.2
2023 Sinker 0.7 4 609 21.6 197 .261 .383 .303 13.1 18.3 17.5 .288 .415 .320 40.5
2023 Slider 1.1 6 556 19.7 110 .264 .377 .298 22.0 12.7 9.8 .271 .368 .286 28.0
2023 Curveball -0.2 -1 324 11.5 84 .265 .458 .315 15.9 17.9 17.4 .263 .497 .316 47.8
2023 Split-Finger 1.3 2 171 6.1 49 .143 .286 .181 35.7 40.8 23.3 .179 .315 .209 51.7
2023 Changeup -6.3 -3 51 1.8 10 .500 .900 .595 12.5 0.0 0.0 .470 .874 .565 40.0
2023 Knuckleball 0.1 0 2 0.1 -- -- -- 100.0 -- -- -- -- -- --
2022 4-Seam Fastball 1.9 18 950 45.4 237 .221 .345 .257 26.4 30.4 22.4 .208 .376 .266 42.9
2022 Curveball -0.2 -1 278 13.3 64 .293 .483 .350 13.8 10.9 14.0 .312 .504 .371 34.0
2022 Sinker 0.0 0 255 12.2 89 .266 .291 .299 11.9 28.1 26.0 .200 .268 .260 27.8
2022 Cutter -1.4 -4 255 12.2 60 .362 .638 .450 21.5 23.3 14.3 .268 .432 .314 40.9
2022 Slider -1.1 -2 187 8.9 48 .298 .383 .345 13.8 18.8 12.3 .216 .262 .219 34.2
2022 Changeup -1.6 -3 167 8.0 44 .279 .395 .323 15.8 13.6 13.0 .283 .485 .336 45.9
! Note: Years are in reverse order.
! Note: To better align with other values, positive numbers (red) are good, and negative numbers (blue) are poor.
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Spin Direction

Year Pitch Type Pitches MPH Active Spin % Total Movement (In.) Spin-Based Observed Deviation
2024 Curveball 220 83.4 81 19.0 7:15 7:00 15
2024 Cutter 11 92.3 55 7.8 12:30 11:45 45
2024 4-Seam Fastball 860 95.9 94 18.1 1:15 1:00 15
2024 Split-Finger 221 85.9 86 10.5 2:15 3:00 -45
2024 Sinker 604 96.0 91 19.7 1:15 2:00 -45
2024 Slider 602 87.2 39 9.2 7:15 8:00 -45
2023 Changeup 50 86.6 99 17.2 2:00 2:30 -30
2023 Curveball 312 81.8 84 18.2 7:15 7:00 15
2023 4-Seam Fastball 1,076 96.1 88 17.0 1:15 1:00 15
2023 Split-Finger 139 84.7 84 11.3 2:30 3:00 -30
2023 Sinker 593 95.8 86 19.1 1:15 2:00 -45
2023 Slider 543 86.2 56 12.7 7:30 8:15 -45
2022 Changeup 167 86.0 99 16.3 2:15 2:45 -30
2022 Curveball 274 80.8 85 17.6 7:15 7:15 0
2022 Cutter 254 88.3 36 5.9 11:45 10:30 75
2022 4-Seam Fastball 941 95.3 87 17.0 1:15 1:00 15
2022 Sinker 223 94.7 84 19.2 1:15 2:00 -45
2022 Slider 181 85.4 48 11.8 7:30 8:30 -60
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! Note: This table is showing data from the PITCHER perspective.
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Swing/Take

Runs
Year Team PA Pitches Heart Shadow Chase Waste All
2022 574 2,210 12 14 -8 -5 12
2023 756 2,825 16 17 -6 -5 23
2024 688 2,604 1 29 -10 -9 11
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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 2,092 55.1 71.9 81.2 29.0 70.7 45.5 67.7 52.6 21.2 8.7 84.1
2023 2,825 56.8 70.9 82.4 32.9 60.7 45.2 69.5 54.5 22.9 8.6 77.9
2024 2,604 51.8 72.9 81.6 32.1 59.7 45.1 66.0 53.2 24.3 7.5 83.7
Player 7,521 54.6 71.8 81.8 31.5 62.9 45.3 67.8 53.5 22.9 8.3 81.5
MLB 48.7 67.0 82.0 28.5 57.8 42.6 61.0 47.2 24.9 7.3 76.3
! Note: All figures in this table cover the period 2015-present.

Percentile Rankings

Year xwOBA /
xERA 		xBA xSLG xISO xOBP Brl Brl% EV Hard
Hit% 		K% BB% Whiff% Chase
Rate 		FB
Velo 		FB
Spin 		CB
Spin 		Extension
2022 71 55 50 46 86 13 22 28 44 63 96 15 45 72 40 12 69
2023 60 25 32 47 84 9 58 43 38 43 100 27 88 85 45 30 47
2024 70 52 41 31 89 2 32 43 66 55 99 43 84 81 43 42 60
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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 24.3 13 14.1 -1 13 14 4 30.8
2023 22.8 22 21.5 1 12 18 8 36.4
2024 24.5 20 20.0 0 9 16 8 40.0
Player 23.8 55 55.6 -1 34 48 20 36.4
Note: xHR tells how many of this pitcher's home runs 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 13 10 11 18 15 14 17 10 9 10 10 19 17 12 16 19 15 11 12 16 11 14 24 15 9 9 19 21 14 14 12
2023 22 18 17 22 25 21 25 19 21 18 20 19 21 18 25 23 23 20 20 27 19 20 33 26 19 16 21 24 22 23 21
2024 20 21 17 23 19 21 23 20 15 14 18 21 22 17 19 17 19 17 21 24 22 21 26 24 16 21 19 19 24 21 19
Player 55 49 45 63 59 56 65 49 45 42 48 59 60 47 60 59 57 48 53 67 52 55 83 65 44 46 59 64 60 58 52
Note: xHR tells how many of this pitcher's home runs 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

Metric 2022 2023 +/-   2024 +/-  
Fastball Velocity 94.0 96.0 2.0 ↑ 95.9 -0.1 ↓
Offspeed Velocity 86.0 85.3 -0.7 ↓ 85.9 0.6 ↑
Breaking Velocity 82.7 84.6 1.9 ↑ 86.2 1.6 ↑
Exit Velocity 89.3 89.2 -0.1 ↓ 89.1 -0.1 ↓
Launch Angle 11.3 12.4 1.1 ↑ 15.1 2.7 ↑
Barrel % 8.9 7.5 -1.4 ↓ 8.6 1.1 ↑
Hard Hit % 38.7 40.9 2.2 ↑ 36.9 -4.0 ↓
LA Sweet-Spot % 31.4 32.0 0.6 ↑ 31.3 -0.7 ↓
xBA .233 .262 0.029 ↑ .241 -0.021 ↓
BA .264 .246 -0.018 ↓ .251 0.005 ↑
xwOBA .284 .305 0.021 ↑ .294 -0.011 ↓
wOBA .302 .284 -0.018 ↓ .294 0.010 ↑
xSLG .379 .425 0.046 ↑ .411 -0.014 ↓
SLG .393 .395 0.002 ↑ .404 0.009 ↑
K% 24.5 22.7 -1.8 ↓ 23.5 0.8 ↑
BB% 4.1 2.5 -1.6 ↓ 3.0 0.5 ↑
Swing % 52.6 54.5 1.9 ↑ 53.2 -1.3 ↓
Whiff% 21.2 22.9 1.7 ↑ 24.3 1.4 ↑
In Zone % 55.1 56.8 1.7 ↑ 51.8 -5.0 ↓
Out of Zone % 44.9 43.2 -1.7 ↓ 48.2 5.0 ↑
Out of Zone Swing % 29.0 32.9 3.9 ↑ 32.1 -0.8 ↓
First Pitch Swing % 38.6 37.5 -1.1 ↓ 38.8 1.3 ↑
First Pitch Strike % 67.7 69.5 1.8 ↑ 66.0 -3.5 ↓
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2022 Shifts 542 .302 258 67 26.0 284 192 67.6
2023 Shades 756 .284 403 32 7.9 353 192 54.4
2024 Shades 687 .294 371 66 17.8 316 189 59.8
! 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 566 16.5 28.1% 0.7% 310 25.3 0.0% 12.6%
2023 793 16.2 27.2% 0.1% 353 21.3 0.0% 0.6%
2024 706 17.2 5.7% 0.8% 349 20.6 0.0% 1.1%

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Pitch Distribution

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