Between the 2020 and 2021 seasons, Jacob deGrom had the highest K/9, with 14.06 per nine innings.

Interpreted as:

single k/9 with a minimum of 0.5 IP per team game leaders MLB 2020 to 2021

	NAME	K/9	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Jacob deGrom J. deGrom	14.06	27	11	4	.733	27	1.63	250	1	1	0	160.0	87	29	35	13	29	1	0	0	592	4	1.63	8.62	0.73	42.2	4.9	0.73	.247	1.97	40	1.66	39	4.89	46.6
2	Tyler Glasnow T. Glasnow	13.25	25	10	3	.769	25	3.22	214	0	0	0	145.1	98	52	52	21	49	0	0	0	578	15	3.03	4.37	1.30	37.0	8.5	1.01	.262	3.22	78	3.12	75	6.07	17.4
3	Shane Bieber S. Bieber	13.24	28	15	5	.750	28	2.48	256	0	0	0	174.0	130	48	51	18	54	5	0	0	702	10	2.79	4.74	0.93	36.5	7.7	1.06	.304	2.64	58	2.59	61	6.72	33.3
4	Corbin Burnes C. Burnes	12.79	40	15	6	.714	37	2.34	322	0	0	0	226.2	160	59	62	9	58	9	2	0	897	10	2.30	5.55	0.36	35.9	6.5	0.96	.303	2.46	55	1.73	40	6.35	65
5	Freddy Peralta F. Peralta	12.54	43	13	6	.684	28	3.01	242	1	0	0	173.2	106	58	61	16	68	14	2	1	705	6	3.52	3.56	0.83	34.3	9.6	1.00	.247	3.16	71	2.99	70	5.49	25.3
6	Carlos Rodón C. Rodón	12.25	28	13	7	.650	26	2.69	191	1	1	0	140.1	100	42	46	14	39	9	0	1	569	8	2.50	4.90	0.90	33.6	6.9	0.99	.272	2.95	61	2.76	62	6.41	25.6
7	Max Scherzer M. Scherzer	11.97	42	20	8	.714	42	2.81	328	2	0	0	246.2	189	77	83	33	59	11	0	1	988	8	2.15	5.56	1.20	33.2	6.0	1.01	.280	3.03	66	3.10	71	6.90	34
8	Gerrit Cole G. Cole	11.93	42	23	11	.676	42	3.11	337	4	2	0	254.1	204	88	96	38	58	4	0	0	1,014	7	2.05	5.81	1.34	33.2	5.7	1.03	.288	3.40	73	3.19	73	7.22	33
9	Trevor Bauer T. Bauer	11.81	28	13	9	.591	28	2.24	237	3	2	0	180.2	112	45	53	28	54	6	0	2	710	6	2.69	4.39	1.39	33.4	7.6	0.92	.218	2.64	53	3.56	81	5.58	17.2
10	Blake Snell B. Snell	11.74	38	11	8	.579	38	3.93	233	0	0	0	178.2	143	78	80	26	87	3	0	1	753	14	4.38	2.68	1.31	30.9	11.6	1.29	.290	4.03	98	3.96	94	7.20	4.9
11	Dinelson Lamet D. Lamet	11.64	34	5	5	.500	21	3.03	150	0	0	0	116.0	87	39	42	11	42	6	1	0	476	4	3.26	3.57	0.85	31.5	8.8	1.11	.285	3.26	75	3.06	71	6.75	16.5
12	Robbie Ray R. Ray	11.61	44	15	12	.556	43	3.64	316	0	0	0	245.0	203	99	102	46	97	5	0	1	1,024	11	3.56	3.26	1.69	30.9	9.5	1.22	.280	3.75	81	4.28	100	7.46	-0.6
13	Aaron Nola A. Nola	11.39	44	14	14	.500	44	4.25	319	3	2	0	252.0	219	119	126	35	62	11	0	3	1,038	1	2.21	5.15	1.25	30.7	6.0	1.12	.301	4.50	100	3.31	76	7.82	29.7
14	Trevor Rogers T. Rogers	10.96	32	8	10	.444	32	3.24	196	0	0	0	161.0	139	58	66	11	59	7	0	2	680	4	3.30	3.32	0.61	28.8	8.7	1.23	.314	3.69	76	2.85	68	7.77	24.3
15	Kevin Gausman K. Gausman	10.94	45	17	9	.654	43	3.00	306	0	0	0	251.2	200	84	92	28	66	4	1	1	1,020	11	2.36	4.64	1.00	30.0	6.5	1.06	.279	3.29	73	3.02	73	7.15	31.6
16	Dylan Cease D. Cease	10.85	44	18	11	.621	44	3.94	270	1	1	0	224.0	189	98	107	32	102	14	0	1	963	14	4.10	2.65	1.29	28.0	10.6	1.30	.288	4.30	90	4.17	92	7.59	8.1
17	Yu Darvish Y. Darvish	10.84	42	16	14	.533	42	3.53	292	0	0	0	242.1	197	95	99	33	58	10	0	2	978	12	2.15	5.03	1.23	29.9	5.9	1.05	.280	3.68	88	3.37	80	7.32	24.1
18	Shohei Ohtani S. Ohtani	10.84	25	9	3	.750	25	3.61	159	0	0	0	132.0	101	53	55	15	52	10	0	2	549	11	3.55	3.06	1.02	29.0	9.5	1.16	.275	3.75	82	3.64	83	6.89	10.5
19	Brandon Woodruff B. Woodruff	10.74	43	12	15	.444	43	2.70	302	1	0	0	253.0	185	76	80	27	61	11	0	0	1,001	3	2.17	4.95	0.96	30.2	6.1	0.97	.263	2.85	63	3.02	70	6.58	36.6
20	Lucas Giolito L. Giolito	10.69	43	15	12	.556	43	3.51	298	2	1	0	251.0	192	98	105	35	80	4	0	1	1,008	15	2.87	3.73	1.25	29.6	7.9	1.08	.266	3.76	80	3.61	80	6.88	24.2
21	Sonny Gray S. Gray	10.68	37	12	12	.500	37	4.05	227	0	0	0	191.1	157	86	93	23	76	10	0	1	810	16	3.57	2.99	1.08	28.0	9.4	1.22	.283	4.37	90	3.71	82	7.39	16.8
22	Tyler Mahle T. Mahle	10.67	43	15	8	.652	42	3.72	270	0	0	0	227.2	192	94	99	30	85	14	0	0	960	6	3.36	3.18	1.19	28.1	8.9	1.22	.289	3.91	83	3.81	85	7.59	17
23	Cristian Javier C. Javier	10.64	48	9	3	.750	19	3.53	184	0	0	2	155.2	103	61	62	27	71	9	5	1	638	10	4.10	2.59	1.56	28.8	11.1	1.12	.219	3.58	82	4.60	107	5.96	-5.5
24	Eduardo Rodriguez E. Rodriguez	10.56	32	13	8	.619	31	4.74	185	0	0	0	157.2	172	83	87	19	47	2	0	0	675	0	2.68	3.94	1.08	27.4	7.0	1.39	.363	4.97	103	3.31	77	9.82	17.5
25	Joe Musgrove J. Musgrove	10.51	40	12	14	.462	39	3.30	258	2	2	0	221.0	175	81	85	27	70	20	1	3	914	4	2.85	3.69	1.10	28.2	7.7	1.11	.275	3.46	82	3.64	86	7.13	15