Players · B · LF · 2013 regular season

Jason Bay

Age: 35
B/T: R/R
Height: 6' 2"
Weight: 210 lb
Number: #38

Born: September 20, 1978 in Trail, BC, Canada
MLB debut: May 23, 2003

dbWAR: 24.2
PA: 236
AVG: .204
OBP: .298
SLG: .393
wRC+: 95

Jason Bay was a left fielder for the Seattle Mariners. In 2013 he hit 11 home runs and knocked in 20 RBIs, notching 42 hits across 236 plate appearances in 67 games. His batting average was .204, 19.6% lower than the league average of .253. He reached base at a .298 clip and slugged .393, for an OPS of .691, 3.2% lower than the league mark of .714 — 8th of 17 on his team, and 254th of 453 among MLB batters with 100+ plate appearances. He made contact on 71.9% of his swings. Adjusted for his ballpark and league, his 95 wRC+ puts his offence 5% below average. That comes to 0.2 dbWAR — -1.4 runs with the bat, +0.0 for the ballpark, +0.0 on the bases, -0.7 on double plays, -2.3 for the position he plays, against replacement level. It includes no fielding: defensive runs are proprietary and are not estimated here, so the figure credits playing a demanding position but not playing it well.

League context

Percentile among qualified batters, 2013 regular season.

wRC+95

wOBA.310

ISO.189

BB%11.0%

WAR.2

How the WAR is built

Runs above replacement, 2013. These terms sum to +1.9 runs, divided by runs-per-win to give WAR. There is no fielding term.

BattingBallparkBaserunningDouble playsPositionReplacement

WAR by season

Batting Regular season

Standard and advanced, by season. Regular-season games only — postseason games are listed separately below. Seasons on file run 2005–2013; his career began in 2003, and earlier seasons are not in this data yet.


2013	SEA	67	236	42	11	20	3	26	62	.204	.298	.393	.189	.231	11.0%	26.3%	.310	-1.4	95	0.2
2012	NYM	63	215	32	8	20	5	19	58	.165	.237	.299	.134	.185	8.8%	27.0%	.243	-12.8	50	-0.8
2011	NYM	122	509	109	12	57	11	56	109	.245	.329	.374	.128	.295	11.0%	21.4%	.316	-1.6	100	1.1
2010	NYM	95	401	90	6	47	10	44	91	.259	.347	.402	.144	.329	11.0%	22.7%	.337	+3.5	111	1.4
2009	BOS	151	638	142	36	119	13	94	162	.267	.384	.537	.269	.315	14.7%	25.4%	.401	+35.4	143	4.9
2008	PIT/BOS	154	670	165	31	101	10	81	137	.286	.373	.522	.236	.321	12.1%	20.4%	.390	+31.6	143	5.0
2007	PIT	145	614	133	21	84	4	59	141	.247	.327	.418	.171	.292	9.6%	23.0%	.331	-2.7	98	1.1
2006	PIT	159	689	163	35	109	11	102	156	.286	.396	.532	.246	.330	14.8%	22.6%	.399	+36.2	142	4.7
2005	PIT	162	707	183	32	101	21	95	142	.306	.402	.559	.254	.350	13.4%	20.1%	.413	+47.9	155	6.6

Separate from the regular season

Postseason Postseason

Wild Card through World Series. These games are counted on their own: none of them are in the regular-season tables, career totals, league context, leaderboards or dbWAR on this page.

Postseason batting

Postseason Jason Bay's postseason batting, by October and round. Not part of any regular-season figure on this page.
Season	Team	Round	G	PA	AB	R	H	2B	HR	RBI	BB	SO	AVG	OBP	SLG	OPS
2009 Post	BOS	ALDS	3	11	8	0	1	0	0	0	3	3	.125	.364	.125	.489
2008 Post	BOS	Postseason total	11	51	41	6	14	3	3	9	9	12	.341	.471	.634	1.105
		ALDS	4	19	17	3	7	2	2	5	2	4	.412	.474	.882	1.356
		ALCS	7	32	24	3	7	1	1	4	7	8	.292	.469	.458	.927
2005–2013		Postseason total · 2 Octobers	14	62	49	6	15	3	3	9	12	15	.306	.452	.551	1.003

Box-score and rate statistics only. wOBA, wRC+, FIP and dbWAR are measured against a full league season, and a postseason is a few teams playing each other for a month, so they are not computed for October.

Platoon splits

How he hits left- and right-handed pitching.

Season

Batting by the hand the pitcher throws with, 2013. 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 LHP	117	106	24	6	11	29	.226	.299	.434	.323	24.8%
vs RHP	119	100	18	5	15	33	.180	.297	.350	.297	27.7%

Spray chart

Where every ball he put in play landed, 2013.

Loading 146 batted balls…

Hot and cold zones

Batting average by pitch location, 2013.

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 .253.

Situational hitting

How Jason Bay hits by base state, outs, score and late-game pressure — each read against his own season line.

Split by

By who is on base when he comes up. The season line is repeated as the baseline.
Situation	PA	AB	H	HR	RBI	BB	SO	AVG	OBP	SLG	wOBA
All situations	236	—	—	—	—	—	—	.204	.298	.393	.310
Bases empty	139	121	29	11	11	16	39	.240	.338	.545	.387
Runner on first	53	47	6	0	0	6	11	.128	.226	.128	.181
Runners on	97	85	13	0	9	10	23	.153	.240	.176	.197
RISP	44	38	7	0	9	4	12	.184	.256	.237	.218

Runners on includes runners in scoring position, which is the convention every reference uses. Counted from play-by-play, 2013.

Not in the 2013 data: exit velocity and launch angle, first recorded in 2015. The play-by-play goes back to 2005, but the measurements on each pitch and batted ball arrived later, so the panels built from them are left off this season.

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Jason Bay

Similar players

Nearest 2013 seasons by discipline, contact, power and speed, on rate statistics rather than totals.

Travis HafnerNYY

wRC+: 89
HR: 12
AVG: .202
WAR: -0.1

Very close

Jason GiambiCLE

wRC+: 86
HR: 9
AVG: .183
WAR: -0.6

Cody RansomCHC

wRC+: 94
HR: 9
AVG: .189
WAR: 0.4

Chris YoungOAK

wRC+: 85
HR: 12
AVG: .200
WAR: 0.4

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.