Isaac Mattson

RHP

Team: Pittsburgh PiratesThrows: RHeight: 6'2"Weight: 214 lbDOB: Jul 14, 1995Born: Erie, PA, USAActive

Compare

Games

5.35

ERA

10.2%

K-BB%

94.2 mph

FB Velo

25.6%

CSW%

Stuff+

-4 vs MLB 100

vL 99vR 92▼

DLoc+

-3 vs MLB 100

vL 98vR 96

Stockyard PLoc+

102

+2 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

-7 vs MLB 100

vL 102vR 100

Synergy

—

Pitch Arsenal

Click a pitch to collapse or expand details

4-Seam Fastball

70.5%|Pitching+104

PLoc+

103-> 2027

Velocity

94.2mph

Spin

2353rpm

CSW%

26.7%

iVB / iHB

18.1" / 9.3"

Stuff+

DLoc+

Pitching+

vs L

103

95▼

106▲

vs R

95▼

94▼

102

Grade drivers

League-average 4-Seam Fastball · 100 → 98.6

Carry along arm slot

+8.8

Break across arm slot

−4.0

Horizontal geometry

−2.4

Seam-shifted wake: amount

−1.6

Vertical approach angle

+1.3

Velocity

−1.0

Everything else

−2.5

Slider

11.3%|Pitching+97

PLoc+

93▼-> 2027

Velocity

84.4mph

Spin

2235rpm

CSW%

25.6%

iVB / iHB

2.8" / -4.3"

Stuff+

DLoc+

Pitching+

vs L

89▼

61▼

vs R

90▼

70▼

Grade drivers

League-average Slider · 100 → 87.1

Velocity

−4.6

Horizontal geometry

−3.6

Arm angle

−1.5

Velo gap vs fastball

+1.4

Seam-shifted wake: direction

+1.1

Release height

−1.1

Everything else

−4.6

Changeup

10.2%|Pitching+94▼

PLoc+

88▼-> 2027

Velocity

86mph

Spin

1250rpm

CSW%

16.2%

iVB / iHB

5.5" / 9.2"

Stuff+

DLoc+

Pitching+

vs L

92▼

74▼

95▼

vs R

73▼

94▼

Grade drivers

League-average Changeup · 100 → 92.9

Vertical break gap vs fastball

+3.2

Break across arm slot

−2.4

Seam-shifted wake: amount

−2.0

Extension

+1.5

Velocity

−1.2

Horizontal geometry

−1.0

Everything else

−5.2

Sweeper

5.2%|Pitching+105▲

PLoc+

105▲-> 2027

Velocity

83.1mph

Spin

2334rpm

CSW%

26.3%

iVB / iHB

-0.9" / -9.5"

Stuff+

DLoc+

Pitching+

vs L

92▼

105▲

104

vs R

84▼

100

104

Grade drivers

League-average Sweeper · 100 → 82.6

Horizontal geometry

−4.5

Arm angle

−2.7

Break across arm slot

−2.6

Velocity

−1.8

Vertical approach angle

−1.8

Seam-shifted wake: amount

−1.2

Everything else

−2.8

Curveball

2.9%|Pitching+105▲

PLoc+

89▼-> 2027

Velocity

83mph

Spin

2187rpm

CSW%

28.6%

iVB / iHB

-1.3" / -5.1"

Stuff+

DLoc+

Pitching+

vs L

93▼

106▲

105▲

vs R

91▼

107▲

105▲

Grade drivers

League-average Curveball · 100 → 91.0

Horizontal geometry

−4.0

Velocity

+3.7

Spin rate

−1.4

Release height

−1.4

Arm angle

−1.1

Extension

+0.8

Everything else

−5.6

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

Isaac Mattson

RHP

Team: Pittsburgh PiratesThrows: RHeight: 6'2"Weight: 214 lbDOB: Jul 14, 1995Born: Erie, PA, USAActive

Compare

Games

5.35

ERA

10.2%

K-BB%

94.2 mph

FB Velo

25.6%

CSW%

Stuff+

-4 vs MLB 100

vL 99vR 92▼

DLoc+

-3 vs MLB 100

vL 98vR 96

Stockyard PLoc+

102

+2 vs MLB 100

2026 Stockyard PLoc+ -> 2027

Pitching+

-7 vs MLB 100

vL 102vR 100

Synergy

—

Pitch Arsenal

Click a pitch to collapse or expand details

4-Seam Fastball

70.5%|Pitching+104

PLoc+

103-> 2027

Velocity

94.2mph

Spin

2353rpm

CSW%

26.7%

iVB / iHB

18.1" / 9.3"

Stuff+

DLoc+

Pitching+

vs L

103

95▼

106▲

vs R

95▼

94▼

102

Grade drivers

League-average 4-Seam Fastball · 100 → 98.6

Carry along arm slot

+8.8

Break across arm slot

−4.0

Horizontal geometry

−2.4

Seam-shifted wake: amount

−1.6

Vertical approach angle

+1.3

Velocity

−1.0

Everything else

−2.5

Slider

11.3%|Pitching+97

PLoc+

93▼-> 2027

Velocity

84.4mph

Spin

2235rpm

CSW%

25.6%

iVB / iHB

2.8" / -4.3"

Stuff+

DLoc+

Pitching+

vs L

89▼

61▼

vs R

90▼

70▼

Grade drivers

League-average Slider · 100 → 87.1

Velocity

−4.6

Horizontal geometry

−3.6

Arm angle

−1.5

Velo gap vs fastball

+1.4

Seam-shifted wake: direction

+1.1

Release height

−1.1

Everything else

−4.6

Changeup

10.2%|Pitching+94▼

PLoc+

88▼-> 2027

Velocity

86mph

Spin

1250rpm

CSW%

16.2%

iVB / iHB

5.5" / 9.2"

Stuff+

DLoc+

Pitching+

vs L

92▼

74▼

95▼

vs R

73▼

94▼

Grade drivers

League-average Changeup · 100 → 92.9

Vertical break gap vs fastball

+3.2

Break across arm slot

−2.4

Seam-shifted wake: amount

−2.0

Extension

+1.5

Velocity

−1.2

Horizontal geometry

−1.0

Everything else

−5.2

Sweeper

5.2%|Pitching+105▲

PLoc+

105▲-> 2027

Velocity

83.1mph

Spin

2334rpm

CSW%

26.3%

iVB / iHB

-0.9" / -9.5"

Stuff+

DLoc+

Pitching+

vs L

92▼

105▲

104

vs R

84▼

100

104

Grade drivers

League-average Sweeper · 100 → 82.6

Horizontal geometry

−4.5

Arm angle

−2.7

Break across arm slot

−2.6

Velocity

−1.8

Vertical approach angle

−1.8

Seam-shifted wake: amount

−1.2

Everything else

−2.8

Curveball

2.9%|Pitching+105▲

PLoc+

89▼-> 2027

Velocity

83mph

Spin

2187rpm

CSW%

28.6%

iVB / iHB

-1.3" / -5.1"

Stuff+

DLoc+

Pitching+

vs L

93▼

106▲

105▲

vs R

91▼

107▲

105▲

Grade drivers

League-average Curveball · 100 → 91.0

Horizontal geometry

−4.0

Velocity

+3.7

Spin rate

−1.4

Release height

−1.4

Arm angle

−1.1

Extension

+0.8

Everything else

−5.6

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

Isaac Mattson

Pitch Arsenal

4-Seam Fastball

Slider

Changeup

Sweeper

Curveball

Similar Pitchers

Game Log

Isaac Mattson

Pitch Arsenal

4-Seam Fastball

Slider

Changeup

Sweeper

Curveball

Similar Pitchers

Game Log