Jason Johnson ERA in 2004

• 5th-best of Jason Johnson's 11 seasons on file; the best is 4.09 in 2001.
• Up 0.95 from 4.18 in 2003.

Average of 11 regular seasons, 1997 through 2008. Figures come from ESPN's box scores and were last read on September 21, 2026.

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Jason Johnson ERA in 2004, 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.
1997	PIT	3	0	0	6.00	6.0	3	1	1.83	0
1998	TB	13	2	5	5.70	60.0	36	27	1.68	0
1999	BAL	22	8	7	5.46	115.1	71	55	1.52	0
2000	BAL	25	1	10	7.02	107.2	79	61	1.67	0
2001	BAL	32	10	12	4.09	196.0	114	77	1.38	0
2002	BAL	22	5	14	4.59	131.1	97	41	1.39	0
2003	BAL	32	10	10	4.18	189.2	118	80	1.56	0
2004	DET	33	8	15	5.13	196.2	125	60	1.43	0
2005	DET	33	8	13	4.54	210.0	93	49	1.34	0
2006	CLE/BOS/CIN	24	3	12	6.10	115.0	54	35	1.70	0
2008	LAD	16	1	2	5.22	29.1	20	12	1.50	0

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