George Kirby
P | Bats/Throws: R/R | 6' 4" 215LBS | Age: 25
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
2 Seasons 21 15 3.37 56 56 0 320.2 305 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
2 Seasons 56 21-15 3.37 320.2 305 1.11
MLB Percentile Rankings
Pitch Distribution

Statcast Statistics

Season Age Pitches Batted
Balls
Barrels Barrel % Barrel/PA Exit
Velocity
Max EV Launch
Angle
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
Player 4917 942 76 8.1 5.9 89.3 115.6 11.9 31.7 .250 .406 .292 .296 .371 40.0 23.5 3.2
MLB 6.9 4.7 88.4 122.4 12.2 33.1 .245 .406 .316 .315 .369 36.3 22.1 8.4
! Note: All figures in this table cover the period 2015-present.

Statcast Pitch Arsenal

Kirby relies on 7 pitches.
4-Seam Fastball
(39.4%) ,
Sinker
(21.6%) ,
Slider
(19.8%) ,
Curveball
(11.4%) ,
Split Finger
(6.1%) ,
Changeup
(1.7%) ,
Knuckleball
(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
Player 45.3 25.7 21.8 7.2 35.5 35.0 29.5 2.7 34.8 24.2 24.2 5.8 8.1 5.9
MLB 44.6 23.5 24.9 7.0 37.0 37.6 25.3 3.9 32.8 24.7 24.4 5.8 6.9 4.7
! Note: All figures in this table cover the period 2015-present.

Pitch Movement


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
2023 Changeup SEA R 49 86.6 31.3 0.5 2 16.0 1.6 11
2023 Curveball SEA R 322 81.8 53.9 3.9 8 9.2 0.9 11
2023 4-Seamer SEA R 1,112 96.1 14.4 -0.5 -4 8.3 0.6 8
2023 Slider SEA R 558 86.2 39.2 4.2 12 11.0 6.4 137
2023 Splitter SEA R 172 84.8 37.5 3.5 10 10.3 -1.1 -10
2023 Sinker SEA R 611 95.8 19.4 -1.0 -5 15.8 0.7 5
2022 4-Seamer SEA R 950 95.3 15.1 -1.1 -8 8.8 1.3 17
2022 Splitter SEA R 9 85.3 34.1 1.8 5 15.0 2.7 22
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 49
2022 Slider SEA R 187 85.5 38.1 2.5 7 10.1 5.1 100
2022 Changeup SEA R 158 86.1 33.4 2.4 8 15.3 0.9 6
2022 Curveball SEA R 278 80.8 53.6 2.5 5 9.9 1.0 11
! 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 %
2023 4-Seamer 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 4 611 21.6 197 .261 .383 .303 13.4 18.3 17.5 .288 .416 .320 40.5
2023 Slider 1.1 6 558 19.8 109 .267 .381 .301 22.1 12.8 9.7 .273 .370 .288 28.3
2023 Curveball -0.2 -1 322 11.4 85 .262 .452 .311 15.8 17.6 17.9 .260 .493 .313 47.1
2023 Splitter 1.3 2 172 6.1 49 .143 .286 .181 35.7 40.8 23.3 .179 .315 .209 51.7
2023 Changeup -6.7 -3 49 1.7 10 .500 .900 .595 9.1 0.0 0.0 .469 .872 .564 40.0
2023 Knuckleball 3.8 0 1 0.0 -- -- -- 100.0 -- -- -- -- -- --
2022 4-Seamer 1.9 18 950 45.4 237 .221 .345 .257 26.4 30.4 22.4 .208 .376 .267 42.9
2022 Curveball -0.3 -1 278 13.3 65 .305 .492 .359 13.7 10.8 14.0 .319 .509 .375 35.2
2022 Cutter -1.4 -4 255 12.2 60 .362 .638 .450 21.5 23.3 14.3 .268 .432 .314 40.9
2022 Sinker 0.0 0 255 12.2 89 .266 .291 .299 11.9 28.1 26.0 .199 .268 .260 27.8
2022 Slider -1.0 -2 187 8.9 47 .283 .370 .333 14.0 19.1 12.3 .205 .251 .209 32.4
2022 Changeup -0.3 0 158 7.6 41 .250 .275 .267 16.4 14.6 13.3 .259 .351 .274 44.1
2022 Splitter -24.7 -2 9 0.4 3 .667 2.000 1.083 0.0 0.0 0.0 .608 2.273 1.195 66.7
! 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
2023 Changeup 48 86.6 99 17.2 2:00 2:30 -30
2023 Curveball 311 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 Splitter 140 84.7 84 11.2 2:30 3:00 -30
2023 Sinker 595 95.8 86 19.1 1:15 2:00 -45
2023 Slider 544 86.2 56 12.7 7:30 8:15 -45
2022 Changeup 158 86.1 99 16.3 2:15 2:45 -30
2022 Curveball 275 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 180 85.5 48 11.8 7:30 8:30 -60
! 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
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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
Player 4,917 56.1 71.3 81.9 31.2 64.7 45.3 68.7 53.7 22.2 8.7 80.5
MLB 48.6 67.0 82.0 28.5 58.0 42.6 60.9 47.1 24.8 7.3 76.1
! 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 84 44 30 47
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Expected Home Runs

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 17 9 40.9
Player 23.3 35 35.6 -1 25 31 13 37.1

Expected Home Runs by Park

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 19 17 22 25 21 25 19 21 17 20 19 20 18 25 23 23 20 20 27 19 20 33 26 18 16 21 24 22 23 21
Player 35 29 28 40 40 35 42 29 30 27 30 38 37 30 41 42 38 31 32 43 30 34 57 41 27 25 40 45 36 37 33
! Note: This tells how many of this player's home runs would have been out of other stadiums. This accounts for different wall heights, distances and environmental effects. For these purposes, the 2020 Blue Jays home field was still Rogers Centre, not Sahlen Field.
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Year to Year Changes

Metric 2022 2023 +/-  
Fastball Velocity 94.0 96.0 2.0
Offspeed Velocity 86.0 85.2 -0.8
Breaking Velocity 82.7 84.6 1.9
Exit Velocity 89.3 89.2 -0.1
Launch Angle 11.3 12.4 1.1
Barrel % 8.9 7.5 -1.4
Hard Hit % 38.7 40.9 2.2
Sweet Spot % 31.4 32.0 0.6
xBA .233 .262 0.029
BA .264 .246 -0.018
xwOBA .284 .305 0.021
wOBA .302 .284 -0.018
xSLG .379 .425 0.046
SLG .393 .395 0.002
K% 24.5 22.7 -1.8
BB% 4.1 2.5 -1.6
Swing % 52.6 54.5 1.9
Whiff% 21.2 22.9 1.7
In Zone % 55.1 56.8 1.7
Out of Zone % 44.9 43.2 -1.7
Out of Zone Swing % 29.0 32.9 3.9
First Pitch Swing % 38.6 37.5 -1.1
First Pitch Strike % 67.7 69.5 1.8
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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
! 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%
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Pitch Distribution