George Kirby

RHP

Team: Seattle MarinersThrows: RHeight: 6'4"Weight: 215 lbDOB: Feb 4, 1998Born: Rye, NY, USAActive

Compare

Games

4.33

ERA

13.6%

K-BB%

96.9 mph

FB Velo

26.4%

CSW%

Stuff+

-1 vs MLB 100

vL 94▼vR 104

DLoc+

109

+9 vs MLB 100

vL 107▲vR 111▲

Stockyard PLoc+

110

+10 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

115

+15 vs MLB 100

vL 107▲vR 107▲

Deception

Synergy

Pitch Arsenal

Click a pitch to collapse or expand details

4-Seam Fastball

28.4%|Pitching+103

PLoc+

111▲-> 2027

Velocity

96.7mph

Spin

2263rpm

CSW%

24.2%

iVB / iHB

13.6" / 9.1"

Stuff+

DLoc+

Pitching+

vs L

86▼

113▲

104

vs R

90▼

112▲

103

Grade drivers

League-average 4-Seam Fastball · 100 → 87.5

Break across arm slot

−3.6

Velocity

+3.1

Horizontal geometry

−2.8

Carry along arm slot

−2.1

Seam-shifted wake: amount

−1.7

Vertical approach angle

−1.7

Everything else

−3.7

Sweeper

24.1%|Pitching+110▲

PLoc+

116▲-> 2027

Velocity

87.7mph

Spin

2387rpm

CSW%

27.9%

iVB / iHB

-2.5" / -10.6"

Stuff+

DLoc+

Pitching+

vs L

104

109▲

vs R

110▲

107▲

109▲

Grade drivers

League-average Sweeper · 100 → 105.8

Velocity

+15.4

Break across arm slot

−4.4

Horizontal geometry

−3.8

Velo gap vs fastball

+1.2

Carry along arm slot

+1.1

Vertical approach angle

−0.8

Everything else

−2.9

Sinker

21%|Pitching+109▲

PLoc+

98-> 2027

Velocity

96.9mph

Spin

2309rpm

CSW%

27.8%

iVB / iHB

8.2" / 16.2"

Stuff+

DLoc+

Pitching+

vs L

100

105▲

vs R

111▲

103

110▲

Grade drivers

League-average Sinker · 100 → 103.1

Velocity

+5.5

Horizontal geometry

−4.0

Carry along arm slot

+3.2

Seam-shifted wake: amount

+2.5

Vertical approach angle

−1.3

Break across arm slot

+1.1

Everything else

−3.9

Curveball

10.3%|Pitching+109▲

PLoc+

111▲-> 2027

Velocity

84.1mph

Spin

2370rpm

CSW%

27.9%

iVB / iHB

-13.1" / -8.9"

Stuff+

DLoc+

Pitching+

vs L

113▲

123▲

111▲

vs R

102

122▲

107▲

Grade drivers

League-average Curveball · 100 → 108.6

Velocity

+8.0

Arm angle

+2.5

Carry along arm slot

+2.3

Horizontal geometry

−2.1

Vertical approach angle

+1.8

Break across arm slot

+1.6

Everything else

−5.5

Changeup

6.2%|Pitching+105▲

PLoc+

105▲-> 2027

Velocity

88.6mph

Spin

1521rpm

CSW%

20%

iVB / iHB

4.6" / 14"

Stuff+

DLoc+

Pitching+

vs L

89▼

103

104

vs R

95▼

104

106▲

Grade drivers

League-average Changeup · 100 → 90.8

Horizontal geometry

−2.3

Break across arm slot

−2.0

Seam-shifted wake: amount

−1.4

Velocity

+1.2

Velo gap vs fastball

+1.2

Extension

+0.7

Everything else

−6.6

Cutter

4.1%|Pitching+101

PLoc+

116▲-> 2027

Velocity

92.9mph

Spin

2303rpm

CSW%

26.3%

iVB / iHB

9" / 0.4"

Stuff+

DLoc+

Pitching+

vs L

92▼

103

vs R

84▼

80▼

Grade drivers

League-average Cutter · 100 → 88.0

Horizontal geometry

−4.2

Velocity

+3.9

Vertical approach angle

−3.6

Carry along arm slot

−2.8

Break across arm slot

−2.0

Seam-shifted wake: amount

−1.7

Everything else

−1.6

Slider

4.1%|Pitching+109▲

PLoc+

108▲-> 2027

Velocity

86.4mph

Spin

2350rpm

CSW%

38.1%

iVB / iHB

-4.6" / -12.8"

Stuff+

DLoc+

Pitching+

vs L

95▼

108▲

vs R

108▲

109▲

Grade drivers

League-average Slider · 100 → 103.3

Velocity

+7.0

Horizontal geometry

−3.6

Velo gap vs fastball

+3.5

Carry along arm slot

+2.5

Break across arm slot

−2.0

Seam-shifted wake: amount

+1.9

Everything else

−6.0

Forkball

1.8%|Pitching+106▲

PLoc+

111▲-> 2027

Velocity

87.1mph

Spin

1091rpm

CSW%

16%

iVB / iHB

-0.5" / 10.3"

Stuff+

DLoc+

Pitching+

vs L

100

111▲

106▲

vs R

101

107▲

105▲

Grade drivers

League-average Forkball · 100 → 100.2

Vertical break gap vs fastball

+2.3

Velo gap vs fastball

+1.8

Release height

−1.4

Horizontal geometry

−1.1

Vertical approach angle

+0.8

Velocity

−0.8

Everything else

−1.4

xRV (Expected Run Value): Expected runs per 100 pitches using xwOBA on batted balls (BABIP-neutral). Negative = good (runs prevented), Positive = bad (runs allowed).

Similar Pitchers

Last 30 games in 2026

George Kirby

RHP

Team: Seattle MarinersThrows: RHeight: 6'4"Weight: 215 lbDOB: Feb 4, 1998Born: Rye, NY, USAActive

Compare

Games

4.33

ERA

13.6%

K-BB%

96.9 mph

FB Velo

26.4%

CSW%

Stuff+

-1 vs MLB 100

vL 94▼vR 104

DLoc+

109

+9 vs MLB 100

vL 107▲vR 111▲

Stockyard PLoc+

110

+10 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

115

+15 vs MLB 100

vL 107▲vR 107▲

Deception

Synergy

Pitch Arsenal

Click a pitch to collapse or expand details

4-Seam Fastball

28.4%|Pitching+103

PLoc+

111▲-> 2027

Velocity

96.7mph

Spin

2263rpm

CSW%

24.2%

iVB / iHB

13.6" / 9.1"

Stuff+

DLoc+

Pitching+

vs L

86▼

113▲

104

vs R

90▼

112▲

103

Grade drivers

League-average 4-Seam Fastball · 100 → 87.5

Break across arm slot

−3.6

Velocity

+3.1

Horizontal geometry

−2.8

Carry along arm slot

−2.1

Seam-shifted wake: amount

−1.7

Vertical approach angle

−1.7

Everything else

−3.7

Sweeper

24.1%|Pitching+110▲

PLoc+

116▲-> 2027

Velocity

87.7mph

Spin

2387rpm

CSW%

27.9%

iVB / iHB

-2.5" / -10.6"

Stuff+

DLoc+

Pitching+

vs L

104

109▲

vs R

110▲

107▲

109▲

Grade drivers

League-average Sweeper · 100 → 105.8

Velocity

+15.4

Break across arm slot

−4.4

Horizontal geometry

−3.8

Velo gap vs fastball

+1.2

Carry along arm slot

+1.1

Vertical approach angle

−0.8

Everything else

−2.9

Sinker

21%|Pitching+109▲

PLoc+

98-> 2027

Velocity

96.9mph

Spin

2309rpm

CSW%

27.8%

iVB / iHB

8.2" / 16.2"

Stuff+

DLoc+

Pitching+

vs L

100

105▲

vs R

111▲

103

110▲

Grade drivers

League-average Sinker · 100 → 103.1

Velocity

+5.5

Horizontal geometry

−4.0

Carry along arm slot

+3.2

Seam-shifted wake: amount

+2.5

Vertical approach angle

−1.3

Break across arm slot

+1.1

Everything else

−3.9

Curveball

10.3%|Pitching+109▲

PLoc+

111▲-> 2027

Velocity

84.1mph

Spin

2370rpm

CSW%

27.9%

iVB / iHB

-13.1" / -8.9"

Stuff+

DLoc+

Pitching+

vs L

113▲

123▲

111▲

vs R

102

122▲

107▲

Grade drivers

League-average Curveball · 100 → 108.6

Velocity

+8.0

Arm angle

+2.5

Carry along arm slot

+2.3

Horizontal geometry

−2.1

Vertical approach angle

+1.8

Break across arm slot

+1.6

Everything else

−5.5

Changeup

6.2%|Pitching+105▲

PLoc+

105▲-> 2027

Velocity

88.6mph

Spin

1521rpm

CSW%

20%

iVB / iHB

4.6" / 14"

Stuff+

DLoc+

Pitching+

vs L

89▼

103

104

vs R

95▼

104

106▲

Grade drivers

League-average Changeup · 100 → 90.8

Horizontal geometry

−2.3

Break across arm slot

−2.0

Seam-shifted wake: amount

−1.4

Velocity

+1.2

Velo gap vs fastball

+1.2

Extension

+0.7

Everything else

−6.6

Cutter

4.1%|Pitching+101

PLoc+

116▲-> 2027

Velocity

92.9mph

Spin

2303rpm

CSW%

26.3%

iVB / iHB

9" / 0.4"

Stuff+

DLoc+

Pitching+

vs L

92▼

103

vs R

84▼

80▼

Grade drivers

League-average Cutter · 100 → 88.0

Horizontal geometry

−4.2

Velocity

+3.9

Vertical approach angle

−3.6

Carry along arm slot

−2.8

Break across arm slot

−2.0

Seam-shifted wake: amount

−1.7

Everything else

−1.6

Slider

4.1%|Pitching+109▲

PLoc+

108▲-> 2027

Velocity

86.4mph

Spin

2350rpm

CSW%

38.1%

iVB / iHB

-4.6" / -12.8"

Stuff+

DLoc+

Pitching+

vs L

95▼

108▲

vs R

108▲

109▲

Grade drivers

League-average Slider · 100 → 103.3

Velocity

+7.0

Horizontal geometry

−3.6

Velo gap vs fastball

+3.5

Carry along arm slot

+2.5

Break across arm slot

−2.0

Seam-shifted wake: amount

+1.9

Everything else

−6.0

Forkball

1.8%|Pitching+106▲

PLoc+

111▲-> 2027

Velocity

87.1mph

Spin

1091rpm

CSW%

16%

iVB / iHB

-0.5" / 10.3"

Stuff+

DLoc+

Pitching+

vs L

100

111▲

106▲

vs R

101

107▲

105▲

Grade drivers

League-average Forkball · 100 → 100.2

Vertical break gap vs fastball

+2.3

Velo gap vs fastball

+1.8

Release height

−1.4

Horizontal geometry

−1.1

Vertical approach angle

+0.8

Velocity

−0.8

Everything else

−1.4

xRV (Expected Run Value): Expected runs per 100 pitches using xwOBA on batted balls (BABIP-neutral). Negative = good (runs prevented), Positive = bad (runs allowed).

Similar Pitchers

Last 30 games in 2026

George Kirby

Pitch Arsenal

4-Seam Fastball

Sweeper

Sinker

Curveball

Changeup

Cutter

Slider

Forkball

Similar Pitchers

Game Log

George Kirby

Pitch Arsenal

4-Seam Fastball

Sweeper

Sinker

Curveball

Changeup

Cutter

Slider

Forkball

Similar Pitchers

Game Log