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 14 11 3.53 33 33 0 191 179 1.07
3 Seasons 35 26 3.43 89 89 0 511.2 484 1.09
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 33 14-11 3.53 191 179 1.07
3 Seasons 89 35-26 3.43 511.2 484 1.09
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 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 2967 568 46 8.1 5.9 89.0 113.9 14.8 30.5 .236 .396 .287 .288 .357 36.3 23.0 3.0 3.53 3.44
Player 7884 1510 122 8.1 5.9 89.2 115.6 13.0 31.3 .245 .402 .290 .293 .366 38.6 23.3 3.1
MLB 7.0 4.8 88.5 122.4 12.3 33.2 .245 .405 .316 .315 .368 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
(33.9%) ,
Slider
(23.7%) ,
Sinker
(23.6%) ,
Split Finger
(10.2%) ,
Knuckle Curve
(8.2%) ,
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 42.8 26.6 21.3 9.3 33.1 36.6 30.3 3.3 33.1 27.8 21.7 5.8 8.1 5.9
Player 44.4 26.0 21.6 8.0 34.6 35.6 29.8 2.9 34.2 25.6 23.2 5.8 8.1 5.9
MLB 44.4 23.8 24.7 7.1 37.2 37.5 25.2 3.9 32.6 24.8 24.4 5.9 7.0 4.8
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


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
2024 Split-Finger SEA R 302 86.0 35.6 2.3 9.6ARM -1.0 1.4 1.2 9.6ARM -1.0
2024 4-Seam Fastball SEA R 1007 96.0 13.9 -0.2 9.3ARM 1.9 15.8 0.0 9.3ARM 1.8
2024 Cutter SEA R 11 92.3 23.6 -0.6 1.0GLV -1.2 8.5 0.2 1.0GLV -1.7
2024 Curveball SEA R 243 83.4 53.7 5.5 8.6GLV 1.1 -14.0 4.1 8.6GLV -0.8
2024 Slider SEA R 702 87.2 38.4 4.5 7.7GLV 3.6 -2.6 4.2 7.7GLV 2.6
2024 Sinker SEA R 701 96.0 18.1 -2.6 15.8ARM 0.9 11.6 -4.3 15.8ARM 1.0
2024 Knuckleball SEA R 1 73.9 43.3 -10.3 2.6ARM 2.2 7.5 -10.4 2.6ARM 2.8
2023 4-Seam Fastball SEA R 1112 96.1 14.4 -0.5 8.3ARM 0.6 15.2 -0.6 8.3ARM 0.9
2023 Slider SEA R 556 86.3 39.2 4.2 11.0GLV 6.5 -2.4 3.9 11.0GLV 5.7
2023 Curveball SEA R 324 81.8 53.9 3.8 9.2GLV 1.0 -12.8 2.9 9.2GLV 0.3
2023 Changeup SEA R 51 86.6 31.3 0.5 16.0ARM 1.6 5.2 0.2 16.0ARM 1.6
2023 Knuckleball SEA R 2 75.1 45.6 -5.4 5.6ARM -1.2 3.5 -5.4 5.6ARM -1.9
2023 Sinker SEA R 609 95.8 19.4 -1.0 15.8ARM 0.7 10.4 -2.8 15.8ARM 0.8
2023 Split-Finger SEA R 171 84.9 37.5 3.6 10.3ARM -1.0 0.4 2.9 10.3ARM -0.8
! 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 %
2024 4-Seam Fastball 1.1 11 1,007 33.9 267 .221 .458 .303 29.1 31.1 21.7 .217 .437 .293 37.6
2024 Slider 1.4 9 702 23.7 162 .226 .316 .253 27.1 22.8 22.6 .236 .388 .288 32.5
2024 Sinker 0.7 5 701 23.6 207 .263 .354 .298 10.5 11.6 12.6 .263 .384 .299 39.1
2024 Split-Finger -1.8 -5 302 10.2 81 .253 .413 .323 29.5 24.7 14.8 .230 .369 .284 33.3
2024 Curveball -2.5 -6 243 8.2 59 .333 .439 .365 28.6 23.7 12.6 .239 .326 .259 34.9
2024 Cutter 0.9 0 11 0.4 1 .000 .000 .000 0.0 0.0 0.0 .043 .060 .044 0.0
2024 Knuckleball -3.4 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 .180 .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 -- -- -- -- -- --
! 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
2024 Curveball 243 83.4 82 19.1 7:15 7:00 15
2024 Cutter 11 92.3 55 7.8 12:30 11:45 45
2024 4-Seam Fastball 996 96.0 94 18.1 1:15 1:00 15
2024 Split-Finger 241 86.0 87 10.7 2:15 3:00 -45
2024 Sinker 691 96.1 91 19.8 1:15 2:00 -45
2024 Slider 696 87.2 41 9.5 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
! 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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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 777 2,967 1 33 -11 -10 14
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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 2,967 52.0 73.2 82.0 31.9 59.8 44.7 66.3 53.4 24.1 7.9 83.4
Player 7,884 54.5 72.0 81.9 31.5 62.7 45.1 67.8 53.6 22.9 8.4 81.5
MLB 48.7 67.0 82.0 28.5 57.8 42.6 61.0 47.2 25.0 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 73 55 44 35 92 3 41 42 70 50 99 39 84 80 44 42 58
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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 13.1 0 14 14 3 23.1
2023 22.8 22 21.3 1 12 18 8 36.4
2024 25.0 22 21.7 0 8 16 10 45.5
Player 24.0 57 56.1 1 34 48 21 36.8
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 9 11 17 14 13 16 9 8 9 9 18 16 11 15 18 14 10 11 15 10 13 23 14 8 8 18 20 13 13 11
2023 22 18 17 22 25 21 24 19 21 18 20 19 20 18 25 23 23 20 20 27 18 20 33 26 18 16 21 23 22 22 21
2024 22 23 19 22 21 23 25 20 17 15 20 23 24 19 22 19 20 19 23 25 23 23 28 27 18 21 21 21 25 23 21
Player 57 50 47 61 60 57 65 48 46 42 49 60 60 48 62 60 57 49 54 67 51 56 84 67 44 45 60 64 60 58 53
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 96.0 0.0
Offspeed Velocity 86.0 85.3 -0.7 86.0 0.7
Breaking Velocity 82.7 84.6 1.9 86.2 1.6
Exit Velocity 89.3 89.2 -0.1 89.0 -0.2
Launch Angle 11.3 12.4 1.1 14.8 2.4
Barrel % 8.9 7.5 -1.4 8.1 0.6
Hard Hit % 38.7 40.9 2.2 36.3 -4.6
LA Sweet-Spot % 31.4 32.0 0.6 30.5 -1.5
xBA .233 .262 0.029 .236 -0.026
BA .264 .246 -0.018 .245 -0.001
xwOBA .284 .305 0.021 .288 -0.017
wOBA .302 .284 -0.018 .287 0.003
xSLG .379 .425 0.046 .396 -0.029
SLG .393 .395 0.002 .393 -0.002
K% 24.5 22.7 -1.8 23.0 0.3
BB% 4.1 2.5 -1.6 3.0 0.5
Swing % 52.6 54.5 1.9 53.4 -1.1
Whiff% 21.2 22.9 1.7 24.1 1.2
In Zone % 55.1 56.8 1.7 52.0 -4.8
Out of Zone % 44.9 43.2 -1.7 48.0 4.8
Out of Zone Swing % 29.0 32.9 3.9 31.9 -1.0
First Pitch Swing % 38.6 37.5 -1.1 38.2 0.7
First Pitch Strike % 67.7 69.5 1.8 66.3 -3.2
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Statcast Fielder Positioning

vs RHHvs LHH
YearAlignment TypePAwOBAPATotal%PATotal%
2022 Shifts 542 .302 258 61 23.6 284 165 58.1
2023 Shades 756 .284 403 32 7.9 353 192 54.4
2024 Shades 776 .288 421 72 17.1 355 213 60.0
! 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 818 17.3 5.0% 0.7% 384 20.6 0.0% 1.0%

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Pitch Distribution