Players · M · Pitcher · 2015

Justin Masterson

Age: 30
B/T: R/R
Height: 6' 6"
Weight: 260 lb
Number: #63

Born: March 22, 1985 in Kingston, Jamaica
MLB debut: April 24, 2008

dbWAR: .0
IP: 59.1
ERA: 5.61
FIP: 4.89
K/9: 7.4
FIP−: 123

Justin Masterson was a relief pitcher for the Boston Red Sox. In 2015 he struck out 49 batters over 59.1 innings across 18 appearances, going 4-2. His ERA of 5.61 was 41.7% higher than the league average of 3.96 — the worst on his team, and 444th of 513 among MLB pitchers with 20+ innings. Stripping out defence, his 4.89 FIP suggests he pitched better than his ERA shows. He missed bats on 19.1% of swings (8.1% of every pitch he threw), walked 9.9% of the batters he faced and struck out 17.9%. His -0.1 dbWAR is built from that FIP rather than runs allowed, so it credits him for what he controls and not for the defence behind him.

League context

Percentile among qualified pitchers, 2015.

FIP4.89

K/97.4

WHIP1.60

WAR-.1

Pitching

Standard and advanced, by season.

																				Trend
2015	BOS	18	9	59.1	4	2	0	68	37	49	27	5.61	4.89	1.60	7.4	4.1	142	123	-0.1	—

Batting

Standard and advanced, by season.

																					Trend
2015	BOS	1	3	2	0	1	0	0	1	.667	.667	.667	.000	1.000	0.0%	33.3%	.587	+0.6	275	0.1	—

Platoon splits

How left- and right-handed hitters fare against him.

Opponent batting by the side the hitter bats from, 2015. Counted from play-by-play, so totals can differ from the box-score season line by a plate appearance or two.
Split	PA	AB	H	HR	BB	SO	AVG	OBP	SLG	wOBA	K%
vs LHB	149	126	39	3	16	22	.310	.409	.508	.403	14.8%
vs RHB	124	109	29	4	11	27	.266	.355	.459	.360	21.8%

Spray chart

Where every ball he put in play landed, 2015.

Loading 2 batted balls…

Hot and cold zones

Batting average by pitch location, 2015.

Below averageLeague averageAbove average

Batting average by location of the pitch that ended each plate appearance, catcher's view. The bordered square is the strike zone; the outer band is chase territory. Cells with fewer than 8 at-bats are left grey rather than shown as signal. League average on the same attribution is .254.

Pitch sequencing

What Justin Masterson throws in each count, and what he follows each pitch with. Select any cell for the breakdown.

ShowBatter

SinkerSliderFour-seamChangeup

Select a count to see exactly what Justin Masterson throws in it.

Pitch arsenal

What he throws, how hard, how often it misses, and what hitters do with it.


Sinker	37.7%	381	86.8	1,575	35.4%	12.2%	88	.318	.860
Slider	29.4%	297	78.7	1,653	49.8%	37.1%	66	.167	.531
Four-Seam Fastball	28.5%	288	87.5	1,274	39.2%	11.2%	75	.360	1.133
Changeup	4.4%	44	85.0	1,305	45.5%	12.5%	6	—	—

Justin Masterson's arsenal by usage. Velocity is average release speed in mph, spin in rpm, and whiff rate is misses per swing — the cleanest single measure of whether a pitch beats hitters. BAA and OPS are what hitters did against each pitch, credited to the one that ended the plate appearance, and are left blank under 15 at-bats.

Head to head

Put Justin Masterson beside up to three others.

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Justin Masterson

Similar players

Nearest 2015 seasons by command, run prevention and role, on rate statistics rather than totals.

Tyler CravyMIL

ERA: 5.70
FIP: 4.70
SO: 35
WAR: 0.0

Very close

Ryan VogelsongSF

ERA: 4.67
FIP: 4.53
SO: 108
WAR: 0.3

Félix DoubrontOAK

ERA: 5.50
FIP: 4.45
SO: 56
WAR: 0.3

Wandy RodriguezTEX

ERA: 4.90
FIP: 4.33
SO: 72
WAR: 0.7

How these are computed

wOBA uses linear weights measured from this season's own play-by-play rather than published constants, and wRC+ is park-adjusted against that same league. dbWAR is our own open implementation — not fWAR or bWAR — and the full derivation, including its simplifications, is on the methodology page.