Shane Bieber had the best ERA in 2020, with an ERA of 1.63.

Interpreted as:

best with a minimum of 1 IP per team game pitcher 2020

	NAME	ERA	SEASON	TM	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	Shane Bieber S. Bieber	1.63	2020	CLE	12	8	1	.889	12	122	0	0	0	77.1	46	14	15	7	21	1	0	0	297	5	14.20	2.44	5.81	0.81	41.1	7.1	0.87	.267	1.75	37	2.06	46	5.35	20.5
2	Trevor Bauer T. Bauer	1.73	2020	CIN	11	5	4	.556	11	100	2	2	0	73.0	41	14	17	9	17	3	0	1	278	3	12.33	2.10	5.88	1.11	36.0	6.1	0.79	.215	2.10	36	2.87	61	5.05	14.1
3	Dallas Keuchel D. Keuchel	1.99	2020	CWS	11	6	2	.750	11	42	0	0	0	63.1	52	14	15	2	17	0	0	0	257	0	5.97	2.42	2.47	0.28	16.3	6.6	1.09	.255	2.13	45	3.07	66	7.39	10.6
4	Yu Darvish Y. Darvish	2.01	2020	CHC	12	8	3	.727	12	93	0	0	0	76.0	59	17	18	5	14	2	0	1	297	3	11.01	1.66	6.64	0.59	31.3	4.7	0.96	.295	2.13	46	2.22	50	6.99	18.6
5	Dinelson Lamet D. Lamet	2.09	2020	SDP	12	3	1	.750	12	93	0	0	0	69.0	39	16	18	5	20	4	0	0	267	1	12.13	2.61	4.65	0.65	34.8	7.5	0.86	.234	2.35	49	2.47	56	5.09	15.1
6	Chris Bassitt C. Bassitt	2.29	2020	OAK	11	5	2	.714	11	55	0	0	0	63.0	56	16	18	6	17	2	0	0	261	2	7.86	2.43	3.24	0.86	21.1	6.5	1.16	.276	2.57	54	3.58	83	8.00	5.2
7	Jacob deGrom J. deGrom	2.38	2020	NYM	12	4	2	.667	12	104	0	0	0	68.0	47	18	21	7	18	0	0	0	268	4	13.76	2.38	5.78	0.93	38.8	6.7	0.96	.288	2.78	57	2.26	52	6.22	15.9
8	Hyun Jin Ryu H. Jin Ryu	2.69	2020	TOR	12	5	2	.714	12	72	0	0	0	67.0	60	20	22	6	17	1	0	0	275	1	9.67	2.28	4.24	0.81	26.2	6.2	1.15	.302	2.96	58	3.00	68	8.06	10.5
9	Kenta Maeda K. Maeda	2.70	2020	MIN	11	6	1	.857	11	80	0	0	0	66.2	40	20	20	9	10	0	0	0	248	0	10.80	1.35	8.00	1.21	32.3	4.0	0.75	.208	2.70	62	2.99	68	5.40	10.5
10	Zach Davies Z. Davies	2.73	2020	SDP	12	7	4	.636	12	63	0	0	0	69.1	55	21	26	9	19	0	0	0	276	2	8.18	2.47	3.32	1.17	22.8	6.9	1.07	.249	3.38	64	3.87	87	7.14	4.4
11	Zac Gallen Z. Gallen	2.75	2020	ARI	12	3	2	.600	12	82	0	0	0	72.0	55	22	24	9	25	2	0	0	291	4	10.25	3.13	3.28	1.13	28.2	8.6	1.11	.266	3.00	61	3.65	84	6.88	5.7
12	Gerrit Cole G. Cole	2.84	2020	NYY	12	7	3	.700	12	94	2	1	0	73.0	53	23	27	14	17	2	0	0	288	2	11.59	2.10	5.53	1.73	32.6	5.9	0.96	.242	3.33	65	3.88	87	6.53	4.9
13	Kyle Hendricks K. Hendricks	2.88	2020	CHC	12	6	5	.545	12	64	1	1	0	81.1	73	26	26	10	8	1	0	1	315	1	7.08	0.89	8.00	1.11	20.3	2.5	1.00	.272	2.88	65	3.54	80	8.08	7.8
14	Carlos Carrasco C. Carrasco	2.91	2020	CLE	12	3	4	.429	12	82	0	0	0	68.0	55	22	22	8	27	2	0	0	280	6	10.85	3.57	3.04	1.06	29.3	9.6	1.21	.292	2.91	66	3.58	81	7.28	6.5
15	Zack Wheeler Z. Wheeler	2.92	2020	PHI	11	4	2	.667	11	53	0	0	0	71.0	67	23	26	3	16	7	0	2	288	0	6.72	2.03	3.31	0.38	18.4	5.6	1.17	.306	3.30	65	3.21	71	8.49	10.3
16	Brandon Woodruff B. Woodruff	3.05	2020	MIL	13	3	5	.375	13	91	1	0	0	73.2	55	25	26	9	18	4	0	0	293	1	11.12	2.20	5.06	1.10	31.1	6.1	0.99	.269	3.18	68	3.20	72	6.72	10.2
17	Marco Gonzales M. Gonzales	3.10	2020	SEA	11	7	2	.778	11	64	1	0	0	69.2	59	24	27	8	7	4	0	0	277	0	8.27	0.90	9.14	1.03	23.1	2.5	0.95	.263	3.49	74	3.31	77	7.62	7.9
18	Adam Wainwright A. Wainwright	3.15	2020	STL	10	5	3	.625	10	54	2	0	0	65.2	54	23	25	9	15	2	0	0	262	0	7.40	2.06	3.60	1.23	20.6	5.7	1.05	.247	3.43	74	4.10	95	7.40	1.5
19	Luis Castillo L. Castillo	3.21	2020	CIN	12	4	6	.400	12	89	1	0	0	70.0	62	25	31	5	24	1	0	0	292	1	11.44	3.09	3.71	0.64	30.5	8.2	1.23	.329	3.99	68	2.64	57	7.97	15.2
20	Aaron Nola A. Nola	3.28	2020	PHI	12	5	5	.500	12	96	2	1	0	71.1	54	26	31	9	23	2	0	2	289	1	12.11	2.90	4.17	1.14	33.2	8.0	1.08	.283	3.91	73	3.18	70	6.81	10.6
21	Dylan Bundy D. Bundy	3.29	2020	LAA	11	6	3	.667	11	72	1	0	0	65.2	51	24	27	5	17	4	0	1	267	2	9.87	2.33	4.24	0.69	27.0	6.4	1.04	.272	3.70	73	2.94	64	6.99	11.7
22	Lance Lynn L. Lynn	3.32	2020	TEX	13	6	3	.667	13	89	1	0	0	84.0	64	31	34	13	25	6	0	0	344	2	9.54	2.68	3.56	1.39	25.9	7.3	1.06	.242	3.64	74	4.18	91	6.86	3.7
23	Antonio Senzatela A. Senzatela	3.44	2020	COL	12	5	3	.625	12	41	1	0	0	73.1	71	28	29	9	18	4	0	0	303	0	5.03	2.21	2.28	1.10	13.5	5.9	1.21	.268	3.56	68	4.56	97	8.71	1.4
24	Lucas Giolito L. Giolito	3.48	2020	CWS	12	4	3	.571	12	97	1	1	0	72.1	47	28	31	8	28	2	0	0	288	3	12.07	3.48	3.46	1.00	33.7	9.7	1.04	.255	3.86	78	3.18	69	5.85	11.2
25	Framber Valdez F. Valdez	3.57	2020	HOU	11	5	3	.625	10	76	0	0	0	70.2	63	28	32	5	16	5	0	0	288	6	9.68	2.04	4.75	0.64	26.4	5.6	1.12	.312	4.08	81	2.84	65	8.02	12.3