Jack Chesbro career ERA

• Best season on file: 1.82 in 1904.
• Most recent: 6.14 in 1909.

Average of 11 regular seasons, 1899 through 1909. Figures come from ESPN's box scores and were last read on September 22, 2026.

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Jack Chesbro 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.
1899	PIT	19	6	9	4.11	149.0	28	59	1.50	0
1900	PIT	32	15	13	3.67	215.2	56	79	1.39	1
1901	PIT	36	21	10	2.38	287.2	129	52	1.09	1
1902	PIT	35	28	6	2.17	286.1	136	62	1.06	1
1903	NYY	40	21	15	2.77	324.2	147	74	1.15	0
1904	NYY	55	41	12	1.82	454.2	239	88	0.94	0
1905	NYY	41	19	15	2.20	303.1	156	71	1.10	0
1906	NYY	49	23	17	2.96	325.0	152	75	1.20	1
1907	NYY	30	10	10	2.53	206.0	78	46	1.16	0
1908	NYY	45	14	20	2.93	288.2	124	67	1.17	1
1909	NYY/BOS	10	0	5	6.14	55.2	20	17	1.69	0

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