Justin Slaten

RHP

Team: Boston Red SoxThrows: RHeight: 6'4"Weight: 222 lbDOB: Sep 15, 1997Born: Longview, TX, USAActive

Compare

Games

4.60

ERA

22.6%

K-BB%

96.6 mph

FB Velo

29.1%

CSW%

Stuff+

108

+8 vs MLB 100

vL 106▲vR 110▲

DLoc+

110

+10 vs MLB 100

vL 108▲vR 113▲

Stockyard PLoc+

-8 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

108

+8 vs MLB 100

vL 107▲vR 105▲

Synergy

—

Pitch Arsenal

Click a pitch to collapse or expand details

Cutter

41.3%|Pitching+110▲

PLoc+

89▼-> 2027

Velocity

93.6mph

Spin

2521rpm

CSW%

32.4%

iVB / iHB

9.1" / -4.1"

Stuff+

DLoc+

Pitching+

vs L

123▲

115▲

112▲

vs R

104

114▲

106▲

Grade drivers

League-average Cutter · 100 → 115.7

Break across arm slot

+11.9

Velocity

+5.6

Vertical approach angle

−3.9

Seam-shifted wake: amount

+1.6

Horizontal geometry

+0.7

Extension

+0.7

Everything else

−0.9

4-Seam Fastball

25.8%|Pitching+106▲

PLoc+

91▼-> 2027

Velocity

96.6mph

Spin

2463rpm

CSW%

20.6%

iVB / iHB

17" / 1.7"

Stuff+

DLoc+

Pitching+

vs L

108▲

78▼

106▲

vs R

113▲

84▼

105▲

Grade drivers

League-average 4-Seam Fastball · 100 → 111.2

Break across arm slot

+10.4

Velocity

+3.5

Carry along arm slot

−1.8

Release height

+0.9

Seam-shifted wake: amount

+0.7

Vertical approach angle

+0.7

Everything else

−3.2

Sweeper

16.9%|Pitching+102

PLoc+

105▲-> 2027

Velocity

86mph

Spin

2631rpm

CSW%

29.1%

iVB / iHB

2" / -14"

Stuff+

DLoc+

Pitching+

vs L

100

vs R

112▲

109▲

105▲

Grade drivers

League-average Sweeper · 100 → 105.5

Velocity

+7.0

Break across arm slot

+6.6

Horizontal geometry

−3.1

Velo gap vs fastball

−2.2

Arm angle

−1.0

Release height

−0.8

Everything else

−1.0

Sinker

12.4%|Pitching+102

PLoc+

101-> 2027

Velocity

97.3mph

Spin

2380rpm

CSW%

33.3%

iVB / iHB

15" / 11.4"

Stuff+

DLoc+

Pitching+

vs L

102

114▲

103

vs R

114▲

100

Grade drivers

League-average Sinker · 100 → 100.7

Carry along arm slot

+10.5

Seam-shifted wake: amount

−5.0

Horizontal geometry

−4.9

Velocity

+4.4

Break across arm slot

−2.7

Vertical approach angle

+2.5

Everything else

−4.1

Curveball

3.5%|Pitching+104

PLoc+

99-> 2027

Velocity

84.9mph

Spin

2703rpm

CSW%

38.9%

iVB / iHB

-11.9" / -6.2"

Stuff+

DLoc+

Pitching+

vs L

108▲

105▲

vs R

108▲

118▲

104

Grade drivers

League-average Curveball · 100 → 108.7

Velocity

+10.0

Carry along arm slot

+2.8

Spin rate

+2.1

Horizontal geometry

−1.8

Release height

−1.7

Extension

+1.7

Everything else

−4.4

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

Justin Slaten

RHP

Team: Boston Red SoxThrows: RHeight: 6'4"Weight: 222 lbDOB: Sep 15, 1997Born: Longview, TX, USAActive

Compare

Games

4.60

ERA

22.6%

K-BB%

96.6 mph

FB Velo

29.1%

CSW%

Stuff+

108

+8 vs MLB 100

vL 106▲vR 110▲

DLoc+

110

+10 vs MLB 100

vL 108▲vR 113▲

Stockyard PLoc+

-8 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

108

+8 vs MLB 100

vL 107▲vR 105▲

Synergy

—

Pitch Arsenal

Click a pitch to collapse or expand details

Cutter

41.3%|Pitching+110▲

PLoc+

89▼-> 2027

Velocity

93.6mph

Spin

2521rpm

CSW%

32.4%

iVB / iHB

9.1" / -4.1"

Stuff+

DLoc+

Pitching+

vs L

123▲

115▲

112▲

vs R

104

114▲

106▲

Grade drivers

League-average Cutter · 100 → 115.7

Break across arm slot

+11.9

Velocity

+5.6

Vertical approach angle

−3.9

Seam-shifted wake: amount

+1.6

Horizontal geometry

+0.7

Extension

+0.7

Everything else

−0.9

4-Seam Fastball

25.8%|Pitching+106▲

PLoc+

91▼-> 2027

Velocity

96.6mph

Spin

2463rpm

CSW%

20.6%

iVB / iHB

17" / 1.7"

Stuff+

DLoc+

Pitching+

vs L

108▲

78▼

106▲

vs R

113▲

84▼

105▲

Grade drivers

League-average 4-Seam Fastball · 100 → 111.2

Break across arm slot

+10.4

Velocity

+3.5

Carry along arm slot

−1.8

Release height

+0.9

Seam-shifted wake: amount

+0.7

Vertical approach angle

+0.7

Everything else

−3.2

Sweeper

16.9%|Pitching+102

PLoc+

105▲-> 2027

Velocity

86mph

Spin

2631rpm

CSW%

29.1%

iVB / iHB

2" / -14"

Stuff+

DLoc+

Pitching+

vs L

100

vs R

112▲

109▲

105▲

Grade drivers

League-average Sweeper · 100 → 105.5

Velocity

+7.0

Break across arm slot

+6.6

Horizontal geometry

−3.1

Velo gap vs fastball

−2.2

Arm angle

−1.0

Release height

−0.8

Everything else

−1.0

Sinker

12.4%|Pitching+102

PLoc+

101-> 2027

Velocity

97.3mph

Spin

2380rpm

CSW%

33.3%

iVB / iHB

15" / 11.4"

Stuff+

DLoc+

Pitching+

vs L

102

114▲

103

vs R

114▲

100

Grade drivers

League-average Sinker · 100 → 100.7

Carry along arm slot

+10.5

Seam-shifted wake: amount

−5.0

Horizontal geometry

−4.9

Velocity

+4.4

Break across arm slot

−2.7

Vertical approach angle

+2.5

Everything else

−4.1

Curveball

3.5%|Pitching+104

PLoc+

99-> 2027

Velocity

84.9mph

Spin

2703rpm

CSW%

38.9%

iVB / iHB

-11.9" / -6.2"

Stuff+

DLoc+

Pitching+

vs L

108▲

105▲

vs R

108▲

118▲

104

Grade drivers

League-average Curveball · 100 → 108.7

Velocity

+10.0

Carry along arm slot

+2.8

Spin rate

+2.1

Horizontal geometry

−1.8

Release height

−1.7

Extension

+1.7

Everything else

−4.4

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

Justin Slaten

Pitch Arsenal

Cutter

4-Seam Fastball

Sweeper

Sinker

Curveball

Similar Pitchers

Game Log

Justin Slaten

Pitch Arsenal

Cutter

4-Seam Fastball

Sweeper

Sinker

Curveball

Similar Pitchers

Game Log