Players · A · Pitcher · 2009 regular season

Alberto Arias

Age: 26
B/T: R/R
Height: 5' 11"
Weight: 180 lb
Number: #50

Born: October 14, 1983 in Santo Domingo, Dominican Republic
MLB debut: May 1, 2007

dbWAR: .8
IP: 45.2
ERA: 3.35
FIP: 3.32
K/9: 7.7
FIP−: 77

Alberto Arias was a relief pitcher for the Houston Astros. In 2009 he struck out 39 batters over 45.2 innings across 42 appearances, going 2-1. His ERA of 3.35 was 22.5% lower than the league average of 4.32 — 6th of 17 on his team, and 107th of 484 among MLB pitchers with 20+ innings. Stripping out defence, his 3.32 FIP suggests the ERA was no fluke. He missed bats on 20.5% of swings (8.7% of every pitch he threw), walked 9.1% of the batters he faced and struck out 18.7%. His 0.8 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, 2009 regular season.

FIP3.32

K/97.7

WHIP1.49

WAR.8

WAR by season

Pitching Regular season

Standard and advanced, by season. Regular-season games only.


2009	HOU	42	0	45.2	2	1	49	17	39	19	3.35	3.32	1.49	7.7	3.7	78	77	0.8
2008	COL/HOU	15	2	21.2	1	1	23	10	13	10	4.15	4.19	1.52	5.4	4.2	96	97	0.2
2007	COL	6	0	7.1	1	0	8	4	3	5	4.91	6.24	1.77	3.7	6.1	110	139	-0.1

Batting Regular season

Standard and advanced, by season. Regular-season games only.


2009	HOU	2	2	1	1	.000	.500	.000	.000	—	50.0%	50.0%	.360	+0.0	121	0.0
2008	HOU/COL	3	3	0	2	.000	.000	.000	.000	.000	0.0%	66.7%	.000	-0.8	-126	-0.0
2007	COL	1	2	0	2	.000	.000	.000	.000	—	0.0%	100.0%	.000	-0.6	-122	-0.0

Platoon splits

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

Season

Opponent batting by the side the hitter bats from, 2009. 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	89	76	21	0	10	17	.276	.375	.395	.346	19.1%
vs RHB	120	104	28	1	9	22	.269	.347	.327	.303	18.3%

Hot and cold zones

Batting average by pitch location, 2009.

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 .262.

Pitch sequencing

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

ShowBatter

Four-seamSliderSinkerIN

Select a count to see exactly what Alberto Arias throws in it.

Pitch arsenal

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

Season


Four-Seam Fastball	54.2%	413	92.9	2,049	41.9%	10.0%	117	.325	.808
Slider	37.9%	289	81.4	1,505	40.1%	41.9%	55	.182	.505
Sinker	4.9%	37	92.7	1,511	45.9%	26.7%	7	—	—
Intentional Ball	1.7%	13	80.7	2,139	0.0%	—	0	—	—

Alberto Arias'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.

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Alberto Arias

Similar players

Nearest 2009 seasons by command, run prevention and role, on rate statistics rather than totals.

Brad ZieglerOAK

ERA: 3.07
FIP: 3.17
SO: 54
WAR: 1.4

Very close

Ramon TroncosoLAD

ERA: 2.72
FIP: 3.58
SO: 55
WAR: 1.1

Very close

Juan GutierrezAZ

ERA: 4.06
FIP: 3.00
SO: 66
WAR: 1.6

Very close

Peter MoylanATL

ERA: 2.84
FIP: 2.95
SO: 61
WAR: 1.5

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.