Joe Nathan, George Sisler and Walter Johnson were tied for playing the most seasons with an ERA better than 1.50, with 5 seasons.

Interpreted as:

most years by a player with a lower than 1.5 era

	NAME	SEAS	ERA	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Joe Nathan J. Nathan	5	1.26	150	9	4	.692	0	159	0	0	83	142.2	85	20	23	7	44	3	123	7	552	7	10.03	2.78	3.61	0.44	28.8	8.0	0.90	.230	1.45	30	2.48	60	5.36	26
2	George Sisler G. Sisler	5	0.82	7	1	2	.333	3	18	3	1	2	33.0	19	3	4	0	10	1	4		119	0	4.91	2.73	1.80	0.00	15.1	8.4	0.88	.211	1.09	30	2.34	78	5.18	2.5
3	Walter Johnson W. Johnson	5	1.33	221	137	63	.685	173	1,168	157	41	10	1701.1	1,229	251	381	14	311	53	46		6,443	46	6.18	1.65	3.76	0.07	18.1	4.8	0.91	.248	2.02	46	1.87	64	6.50	195.7
4	Charlie Culberson C. Culberson	4	0.00	7	0	0		0	1	0	0	0	6.1	5	0	0	0	3	0	7	0	26	1	1.42	4.26	0.33	0.00	3.8	11.5	1.26	.227	0.00	0	4.26	100	7.11	0
5	Kevin Plawecki K. Plawecki	4	0.00	5	0	0		0	0	0	0	0	4.2	1	0	0	0	1	0	5	0	16	0	0.00	1.93	0.00	0.00	0.0	6.3	0.43	.067	0.00	0	3.81	88	1.93	0.3
6	Craig Kimbrel C. Kimbrel	4	1.15	219	16	4	.800	0	380	0	0	128	219.1	108	28	30	13	64	9	174	3	831	17	15.59	2.63	5.94	0.53	45.7	7.7	0.78	.260	1.23	28	1.40	36	4.43	63.1
7	Ed Walsh E. Walsh	4	1.36	145	76	46	.623	116	666	98	27	13	1091.0	770	165	254	7	174	17	26		4,086	20	5.49	1.44	3.83	0.06	16.3	4.3	0.87	.237	2.10	59	1.60	70	6.35	81.1
8	Mordecai Brown M. Brown	4	1.31	164	102	30	.773	124	546	106	32	18	1165.1	838	169	249	5	203	22	38		4,338	21	4.22	1.57	2.69	0.04	12.6	4.7	0.89	.234	1.92	52	1.91	73	6.47	92.3
9	John Morrill J. Morrill	4	0.53	6	0	0		0	4	0	0	0	17.0	17	1	4	0	1	0	4		59	1	2.12	0.53	4.00	0.00	6.8	1.7	1.06	.315	2.12	23	2.41	96	9.00	0.3
10	Emmanuel Clase E. Clase	3	1.08	222	11	11	.500	0	217	0	0	113	216.2	133	26	46	7	36	3	184	6	820	9	9.01	1.50	6.03	0.29	26.5	4.4	0.78	.226	1.91	27	2.10	52	5.52	47.1
11	Daniel Robertson D. Robertson	3	0.00	3	0	0		0	0	0	0	0	3.0	2	0	0	0	0	0	3	0	10	0	0.00	0.00		0.00	0.0	0.0	0.67	.200	0.00	0	3.17	75	6.00	0.4
12	Bryan Holaday B. Holaday	3	0.00	3	0	0		0	0	0	0	0	2.0	2	0	0	0	0	0	3	0	8	1	0.00	0.00		0.00	0.0	0.0	1.00	.250	0.00	0	3.16	71	9.00	0.3
13	Mitch Moreland M. Moreland	3	0.00	3	0	0		0	2	0	0	0	3.0	3	0	0	0	0	0	3	0	12	0	6.00	0.00		0.00	16.7	0.0	1.00	.300	0.00	0	1.81	45	9.00	0.8
14	Carson Smith C. Smith	3	0.51	20	1	0	1.000	0	19	0	0	1	17.2	11	1	2	0	6	0	2	0	67	0	9.68	3.06	3.17	0.00	28.4	9.0	0.96	.262	1.02	11	2.01	50	5.60	4
15	John Cangelosi J. Cangelosi	3	0.00	3	0	0		0	0	0	0	0	4.0	1	0	0	0	2	0	3	0	15	1	0.00	4.50	0.00	0.00	0.0	13.3	0.75	.077	0.00	0	4.43	114	2.25	-0.3
16	Al Hrabosky A. Hrabosky	3	0.84	30	2	1	.667	0	24	0	0	1	42.2	28	4	5	1	12	0	11	1	166	4	5.06	2.53	2.00	0.21	14.5	7.2	0.94	.209	1.05	23	2.58	72	5.91	4.6
17	Bob Chipman B. Chipman	3	0.00	4	1	0	1.000	0	4	0	0	0	8.0	6	0	0	0	5	0	2		34	0	4.50	5.63	0.80	0.00	11.8	14.7	1.38	.240	0.00	0	3.45	97	6.75	0.2
18	Jack Bentley J. Bentley	3	0.38	9	1	2	.333	3	6	0	0	1	23.2	13	1	4	0	6	0	3		82	1	2.28	2.28	1.00	0.00	7.3	7.3	0.80	.186	1.52	13	2.73	92	4.94	0.6
19	Babe Adams B. Adams	3	1.12	37	16	5	.762	18	76	11	3	2	192.1	134	24	38	1	30	3	14		711	2	3.56	1.40	2.53	0.05	10.7	4.2	0.85	.221	1.78	40	2.18	73	6.27	16.1
20	Christy Mathewson C. Mathewson	3	1.30	136	93	26	.782	114	614	92	27	10	1004.2	725	145	227	11	142	4	19		3,761	12	5.50	1.27	4.32	0.10	16.3	3.8	0.86	.239	2.03	50	1.63	60	6.49	118.9
21	Willi Castro W. Castro	2	0.00	3	0	0		0	0	0	0	0	2.1	1	0	0	0	0	0	3	0	8	0	0.00	0.00		0.00	0.0	0.0	0.43	.125	0.00	0	3.15	76	3.86	0.3
22	Garrett Hampson G. Hampson	2	0.00	2	0	0		0	0	0	0	0	2.0	0	0	0	0	0	1	2	0	7	0	0.00	0.00		0.00	0.0	0.0	0.00	.000	0.00	0	4.64	114	0.00	-0.1
23	Weston Wilson W. Wilson	2	0.00	3	0	0		0	0	0	0	0	4.0	4	0	0	0	0	0	3	0	16	0	0.00	0.00		0.00	0.0	0.0	1.00	.250	0.00	0	3.14	75	9.00	0.5
24	Michael Stefanic M. Stefanic	2	0.00	2	0	0		0	0	0	0	0	2.0	1	0	0	0	0	1	2	0	8	0	0.00	0.00		0.00	0.0	0.0	0.50	.143	0.00	0	4.64	111	4.50	-0.1
25	Leo Rivas L. Rivas	2	0.00	3	0	0		0	0	0	0	0	3.0	5	0	1	0	1	0	3	0	15	0	0.00	3.00	0.00	0.00	0.0	6.7	2.00	.357	3.00	0	4.15	105	15.00	-0.1