Buck O'brien career ERA

• Best season on file: 0.38 in 1911.
• Most recent: 3.73 in 1913.

Average of 3 regular seasons, 1911 through 1913. Figures come from ESPN's box scores and were last read on September 23, 2026.

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Buck O'brien 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.
1911	BOS	6	5	1	0.38	47.2	31	21	1.07	0
1912	BOS	37	20	13	2.58	275.2	115	90	1.19	0
1913	BOS/CHW	21	4	11	3.73	108.2	58	48	1.58	0

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