Barry Zito career ERA

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4.04Career Regular Season

Barry Zito has a career ERA of 4.04 over 15 regular seasons.

• Best season on file: 2.72 in 2000.
• Most recent: 10.29 in 2015.

Figures come from ESPN's box scores and were last read on September 22, 2026.

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Barry Zito career ERA, season by season

Season↓	Team↓	GP↓iGP: Games the player appeared in, however briefly.	W↓iW: Games in which this pitcher was credited with the win.	L↓iL: Games in which this pitcher was charged with the loss.	ERA↓iERA: Earned runs allowed per nine innings pitched — lower is better. Under 3.00 is excellent.	IP↓iIP: Innings pitched. The decimal counts outs, so 6.2 is six innings and two more outs.	K↓iK: Batters this pitcher struck out.	BB↓iBB: Times the batter reached first base on four balls.	WHIP↓iWHIP: Walks and hits allowed per inning pitched — lower is better. Around 1.00 is elite.	SV↓iSV: Games finished by protecting a narrow lead to the last out.
2000	ATH	14	7	4	2.72	92.2	78	45	1.18	0
2001	ATH	35	17	8	3.49	214.1	205	80	1.23	0
2002	ATH	35	23	5	2.75	229.1	182	78	1.13	0
2003	ATH	35	14	12	3.30	231.2	146	88	1.18	0
2004	ATH	34	11	11	4.48	213.0	163	81	1.39	0
2005	ATH	35	14	13	3.86	228.1	171	89	1.20	0
2006	ATH	34	16	10	3.83	221.0	151	99	1.40	0
2007	SF	34	11	13	4.53	196.2	131	83	1.35	0
2008	SF	32	10	17	5.15	180.0	120	102	1.60	0
2009	SF	33	10	13	4.03	192.0	154	81	1.35	0
2010	SF	34	9	14	4.15	199.1	150	84	1.34	0
2011	SF	13	3	4	5.87	53.2	32	24	1.40	0
2012	SF	32	15	8	4.15	184.1	114	70	1.39	0
2013	SF	30	5	11	5.74	133.1	86	54	1.70	0
2015	ATH	3	0	0	10.29	7.0	2	6	2.57	0

What the columns mean: W · L · ERA · IP · K · BB · WHIP · SV