Mason Montgomery

PIT · LHP · 2026

66.7 IP · 276 BF · 1,169 pitches · 2026 season

HIGH Descriptive — not a forecast

118

Stuff+

108

ABStuff+

115

Pitching+

38.0%

8.7%

BB%

2.80

FIP

Grades describe this season's stuff and run prevention. They are not forecasts: on clean season pairs the model has not beaten naive persistence (RESULTS-MLB §13), so nothing here projects next season.

Percentile rankings

vs 2026 graded MLB pitchers · 66.7 IP · 276 BF · 1,169 pitches · 2026 season

Stuff

Stuff+

118

ABStuff+

108

Whiff%

30.3%

CSW%

37.5%

Results

Pitching+

115

FIP

2.80

RA/9

3.91

GB%

53.4%

Command

38.0%

BB%

8.7%

K-BB%

29.3%

Velo

95.5

How to read these

Each row is his rank, 1 to 99, among all graded MLB pitchers this season; the tick is the median. Green is good for him, red bad, whatever the stat's direction (a low FIP ranks high). Grey circles are descriptive rates with no good direction, and n= in place of a rank means too few events to rank. Grades are descriptive, not forecasts.

ArsenalKey columns; every column is on the Arsenal tab

Pitch

Usage

Velo

IVB

Spin

Whiff%

CSW%

Zone%

Chase%

Stuff+

ABStuff+

46.4%

98.5

17.9

4.4

2225

27.6%

34.8%

52.4%

31.0%

116

108

24.5%

98.7

14.6

11.5

2219

30.8%

43.0%

58.0%

25.8%

115

108

14.0%

89.6

1.4

-1.7

2647

37.0%

34.1%

32.9%

37.3%

125

108

13.2%

86.5

-6.7

-2.2

2690

34.2%

40.7%

36.4%

40.8%

129

108

2.0%

89.8

10.3

8.8

1663

10.0%

35.7%

47.8%

25.0%

107

108

Movement Profile

SL-0.2/-2.4SI+3.4/+1.8CH+2.1/+4.2FF+0.8/+1.3CB+4.8/-5.6ring = slot expectation ±1σ/2σ · HB mirrored for LHP · descriptive

Release Traits

Height: 5.65 ft (±0.14)

Side: 1.11 ft (±0.16)

Extension: 6.94 ft

Season means; the ± is the SD across his pitches. Per-pitch release plots land in a later wave.

Batted Ball Against

Pitch

N_BIP

GB%

FB%

LD%

PU%

Avg EV

Avg LA

HrdHit%

46.0

20.6

25.4

0.0

82.6

27.0

46.0

55.9

14.7

23.5

0.0

85.1

22.6

52.9

59.3

29.6

7.4

0.0

82.7

4.9

40.7

61.1

16.7

11.1

0.0

76.9

1.8

11.1

75.0

0.0

25.0

0.0

80.1

-18.8

50.0

Every pitch type he threw, ordered by balls in play. Rows under 5 BIP are dimmed rather than dropped — a slider put in play twice is a fact about the slider.