Duke Esper career ERA

• Best season on file: 3.56 in 1891.
• Most recent: 5.98 in 1898.

Average of 9 regular seasons, 1890 through 1898. Figures come from ESPN's box scores and were last read on September 23, 2026.

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Duke Esper 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.
1890	PIT/PHI	25	13	11	4.55	201.2	88	93	1.62	0
1891	PHI	39	20	15	3.56	296.0	108	121	1.43	1
1892	PHI/PIT	24	13	6	3.63	178.2	50	70	1.45	1
1893	—	42	12	28	4.71	334.1	78	156	1.79	0
1894	—	34	15	12	5.81	217.0	49	75	1.65	2
1895	—	34	10	12	3.92	218.1	39	79	1.50	1
1896	—	20	14	5	3.58	155.2	19	39	1.33	0
1897	STL	8	1	6	5.28	61.1	8	12	1.74	0
1898	STL	10	3	5	5.98	64.2	14	22	1.67	0

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