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George Kirby
Seattle Mariners · SP Throws: R Bats: R Height: 6'4 Weight: 215 Born: )
Percentile Ranks
vs LHH
vs RHH
K%
53.8
84.6
xWOBA
0.354 · 41%
0.256 · 100%
xSLG
30.8
98.1
 

Year Team G GS W-L IP ERA WHIP K% CSW% BB% xAVG xSLG xwOBA xISO BAR% SS% HH% GB% LD% FB% Z%
Z
Sw%
OZ%
OZ
Sw%
Apr May Jun Jul Aug Sep
2025882-442.24.851.1823.4%0.0%5.1%.258.422.312.1638.1%31.7%42%43%27%25%52%14%48%40% 0.0 2.0 17.7 0.0 0.0 0.0
2024333314-11191.03.531.0723.0%0.0%3.0%.236.396.288.1608.1%30.5%36%43%21%27%52%18%48%39% 15.3 14.4 23.2 19.1 8.9 20.1
2023313113-10190.23.351.0422.7%0.0%2.5%.262.425.305.1637.5%32.0%41%45%22%26%57%17%43%39% 17.5 19.5 15.1 19.5 20.8 13.9
202225258-5130.03.391.2124.5%0.0%4.1%.233.379.284.1468.9%31.4%39%46%21%26%55%19%45%29% 0.0 17.6 11.6 17.5 23.4 16.6


2025 Splits vs LHB vs RHB
Pitch Type MPH SPIN Whiff% Usage xBAVG xWOBA K% BB% xSLG ISO HR Usage xBAVG xWOBA K% BB% xSLG ISO HR
4-SeamerFastball MPH0%53%.271.33415.810.5.411.118144%.117.14347.45.3.141.0000
SliderBreaking87.4 MPH236522%33%.262.32820.05.0.477.211150%.273.27131.80.0.382.0480
ChangeupOffspeed87.4 MPH14940%6%.053.0480.00.0.059.00000%.651.6020.00.0.724.0000
Split-fingerOffspeed86.4 MPH91513%8%.547.5100.00.0.625.00005%.000.36350.00.0.000.0000
2024 Splits vs LHB vs RHB
Pitch Type MPH SPIN Whiff% Usage xBAVG xWOBA K% BB% xSLG ISO HR Usage xBAVG xWOBA K% BB% xSLG ISO HR
4-SeamerFastball MPH0%50%.223.28826.24.1.424.235750%.214.29936.14.1.456.2397
CutterFastball MPH0%0%.043.0440.00.0.060.00001%.000.0000.00.0.000.0000
SliderBreaking87.2 MPH236427%30%.260.32520.37.2.426.141240%.219.25924.70.0.359.0551
Split-fingerOffspeed86.0 MPH94630%20%.269.31420.40.0.459.19629%.147.20333.30.0.178.0830
2023 Splits vs LHB vs RHB
Pitch Type MPH SPIN Whiff% Usage xBAVG xWOBA K% BB% xSLG ISO HR Usage xBAVG xWOBA K% BB% xSLG ISO HR
4-SeamerFastball MPH28%43%.254.30020.63.6.419.140337%.254.32237.04.1.463.1877
SinkerFastball95.8 MPH222713%11%.267.34632.06.0.501.170230%.283.30213.40.7.374.0962
CurveballBreaking81.8 MPH234316%14%.298.33327.10.0.511.36429%.222.2565.60.0.389.2121
SliderBreaking86.3 MPH233522%18%.321.3277.72.6.390.167121%.246.26515.51.4.356.0861
ChangeupOffspeed86.6 MPH151813%4%.000.8740.00.0.470.56510%.000.0000.00.0.000.0000
SplitterOffspeed MPH0%10%.098.11339.00.0.171.12512%.375.51650.00.0.875.6671

Splits vs LHB vs RHB
Year PA xBAVG xWOBA xSLG ISO K% BB% HR PA xBAVG xWOBA xSLG ISO K% BB% HR
2025 101.285.354.492.23419.8%6.9%674.222.256.325.08828.4%2.7%1
2024 355.238.294.409.17724.5%4.2%12422.234.282.387.12621.6%1.9%10
2023 353.258.303.428.15723.2%2.8%10403.265.307.422.14122.3%2.0%12
2022 284.215.263.342.09427.1%4.9%4258.252.307.419.16821.7%3.1%9
  Home Road
Season PA xAVG xWOBA K% BB% xSLG ISO HR PA xAVG xWOBA K% BB% xSLG ISO HR
202589.278.33119.1%6.7%.444.183486.238.29327.9%3.5%.399.1633
2024355.238.29424.5%4.2%.409.17712445.250.31321.3%2.9%.456.18917
2023358.240.27626.8%2.5%.369.1289398.281.33119.1%2.3%.475.16713
2022297.231.27525.9%3.4%.366.1349245.234.29522.9%4.9%.395.1234

Split Games Wind 0-9 mph+ Wind 10+ mph Humid 0-25 Humid 25-50 Humid 50-75 Humid 75-100 Temp 0-40 Temp 40-60 Temp 61-79 Temp 80+
Road 15.88 13.52 21.79 0.00 13.68 22.21 13.38 0.00 12.95 15.44 17.22
Home 17.69 15.10 21.18 0.00 21.05 15.50 14.83 0.00 16.71 16.06 21.17