Ranger Suárez had the best ERA with 100.0+ innings pitched in 2021, with an ERA of 1.36.

Interpreted as:

lowest era by a player in 2021, min 100 ip

	NAME	ERA	IP	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	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	Ranger Suárez R. Suárez	1.36	106.0	2021	PHI	39	8	5	.615	12	107	1	1	4	73	16	20	4	33	5	13	3	418	1	9.08	2.80	3.24	0.34	25.6	7.9	1.00	.257	1.70	32	2.71	63	6.20	18.7
2	Carlos Rodón C. Rodón	2.37	132.2	2021	CWS	24	13	5	.722	24	185	1	1	0	91	35	39	13	36	8	0	1	534	7	12.55	2.44	5.14	0.88	34.6	6.7	0.96	.267	2.65	54	2.64	59	6.17	25.8
3	Corbin Burnes C. Burnes	2.43	167.0	2021	MIL	28	11	5	.688	28	234	0	0	0	123	45	47	7	34	6	0	0	657	5	12.61	1.83	6.88	0.38	35.6	5.2	0.94	.309	2.53	58	1.62	38	6.63	48.9
4	Max Scherzer M. Scherzer	2.46	179.1	2021	TOT	30	15	4	.789	30	236	1	0	0	119	49	53	23	36	10	0	0	693	2	11.84	1.81	6.56	1.15	34.1	5.2	0.86	.247	2.66	59	2.97	69	5.97	26
5	Walker Buehler W. Buehler	2.47	207.2	2021	LAD	33	16	4	.800	33	212	0	0	0	149	57	61	19	52	6	0	2	815	5	9.19	2.25	4.08	0.82	26.0	6.4	0.97	.247	2.64	61	3.15	74	6.46	26
6	Brandon Woodruff B. Woodruff	2.56	179.1	2021	MIL	30	9	10	.474	30	211	0	0	0	130	51	54	18	43	7	0	0	708	2	10.59	2.16	4.91	0.90	29.8	6.1	0.96	.261	2.71	61	2.95	69	6.52	26.4
7	Trevor Bauer T. Bauer	2.59	107.2	2021	LAD	17	8	5	.615	17	137	1	0	0	71	31	36	19	37	3	0	1	432	3	11.45	3.09	3.70	1.59	31.7	8.6	1.00	.220	3.01	64	4.03	94	5.93	3.1
8	Trevor Rogers T. Rogers	2.64	133.0	2021	MIA	25	7	8	.467	25	157	0	0	0	107	39	46	6	46	5	0	2	550	4	10.62	3.11	3.41	0.41	28.5	8.4	1.15	.301	3.11	63	2.54	61	7.24	24.3
9	Lance Lynn L. Lynn	2.69	157.0	2021	CWS	28	11	6	.647	28	176	1	1	0	123	47	52	18	45	2	0	2	641	5	10.09	2.58	3.91	1.03	27.5	7.0	1.07	.263	2.98	62	3.31	74	7.05	19.4
10	Zack Wheeler Z. Wheeler	2.78	213.1	2021	PHI	32	14	10	.583	32	247	3	2	0	169	66	72	16	46	8	0	1	849	6	10.42	1.94	5.37	0.68	29.1	5.4	1.01	.288	3.04	66	2.58	60	7.13	40.7
11	Freddy Peralta F. Peralta	2.81	144.1	2021	MIL	28	10	5	.667	27	195	1	0	0	84	45	47	14	56	11	0	1	580	4	12.16	3.49	3.48	0.87	33.6	9.7	0.97	.230	2.93	67	3.11	73	5.24	18.6
12	Kevin Gausman K. Gausman	2.81	192.0	2021	SFG	33	14	6	.700	33	227	0	0	0	150	60	66	20	50	4	0	1	775	7	10.64	2.34	4.54	0.94	29.3	6.5	1.04	.274	3.09	70	3.00	74	7.03	23.5
13	Robbie Ray R. Ray	2.84	193.1	2021	TOR	32	13	7	.650	32	248	0	0	0	150	61	62	33	52	4	0	0	773	5	11.54	2.42	4.77	1.54	32.1	6.7	1.04	.268	2.89	63	3.68	87	6.98	11.8
14	Cal Quantrill C. Quantrill	2.89	149.2	2021	CLE	40	8	3	.727	22	121	0	0	0	129	48	55	16	47	9	2	0	616	3	7.28	2.83	2.57	0.96	19.6	7.6	1.18	.267	3.31	68	4.06	97	7.76	2.1
15	Julio Urías J. Urías	2.96	185.2	2021	LAD	32	20	3	.870	32	195	0	0	0	151	61	67	19	38	7	0	3	745	2	9.45	1.84	5.13	0.92	26.2	5.1	1.02	.272	3.25	73	3.12	73	7.32	23.8
16	Marcus Stroman M. Stroman	3.02	179.0	2021	NYM	33	10	13	.435	33	158	0	0	0	161	60	70	17	44	7	0	2	730	7	7.94	2.21	3.59	0.85	21.6	6.0	1.15	.286	3.52	76	3.49	83	8.09	14.2
17	Logan Webb L. Webb	3.03	148.1	2021	SFG	27	11	3	.786	26	158	0	0	0	128	50	53	9	36	8	0	0	596	2	9.59	2.18	4.39	0.55	26.5	6.0	1.11	.309	3.22	75	2.71	67	7.77	23.1
18	Max Fried M. Fried	3.04	165.2	2021	ATL	28	14	7	.667	28	158	2	2	0	139	56	61	15	41	7	0	0	667	7	8.58	2.23	3.85	0.81	23.7	6.1	1.09	.278	3.31	72	3.30	79	7.55	16.6
19	Adam Wainwright A. Wainwright	3.05	206.1	2021	STL	32	17	7	.708	32	174	3	1	0	168	70	72	21	50	9	0	3	828	4	7.59	2.18	3.48	0.92	21.0	6.0	1.06	.256	3.14	75	3.66	88	7.33	11.5
20	Pablo López P. López	3.07	102.2	2021	MIA	20	5	5	.500	20	115	0	0	0	89	35	37	11	26	7	0	1	418	3	10.08	2.28	4.42	0.96	27.5	6.2	1.12	.301	3.24	73	3.28	79	7.80	10.1
21	Framber Valdez F. Valdez	3.14	134.2	2021	HOU	22	11	6	.647	22	125	1	0	0	110	47	52	12	58	11	0	1	572	9	8.35	3.88	2.16	0.80	21.9	10.1	1.25	.268	3.48	73	4.00	95	7.35	3.4
22	Chris Bassitt C. Bassitt	3.15	157.1	2021	OAK	27	12	4	.750	27	159	1	1	0	127	55	55	15	39	11	0	1	637	5	9.10	2.23	4.08	0.86	25.0	6.1	1.06	.271	3.15	77	3.33	80	7.26	14.5
23	Lance McCullers Jr. L. McCullers Jr.	3.16	162.1	2021	HOU	28	13	5	.722	28	185	0	0	0	122	57	59	13	76	10	0	0	684	7	10.26	4.21	2.43	0.72	27.0	11.1	1.22	.273	3.27	74	3.51	83	6.76	13
24	Anthony DeSclafani A. DeSclafani	3.17	167.2	2021	SFG	31	13	7	.650	31	152	2	2	0	141	59	61	19	42	2	0	1	676	7	8.16	2.25	3.62	1.02	22.5	6.2	1.09	.265	3.27	79	3.61	89	7.57	8.6
25	Joe Musgrove J. Musgrove	3.18	181.1	2021	SDP	32	11	9	.550	31	203	2	2	0	142	64	68	22	54	18	1	3	748	3	10.08	2.68	3.76	1.09	27.1	7.2	1.08	.266	3.38	81	3.69	88	7.05	10.2