George Kirby had the highest K/BB with 150.0+ innings pitched in 2023, with 9.05 K/BB.

	NAME	K/BB	IP	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	George Kirby G. Kirby	9.05	190.2	2023	SEA	31	12	10	.545	31	3.35	172	1	0	0	179	71	74	22	19	6	0	1	757	1	8.12	0.90	1.04	22.7	2.5	1.04	.292	3.49	83	3.34	81	8.45	16.7
2	Zach Eflin Z. Eflin	7.75	177.2	2023	TBR	31	16	8	.667	31	3.50	186	0	0	0	158	69	69	19	24	3	0	1	703	0	9.42	1.22	0.96	26.5	3.4	1.02	.295	3.50	85	3.00	72	8.00	23.2
3	Logan Webb L. Webb	6.26	216.0	2023	SFG	33	10	11	.476	33	3.25	194	2	1	0	201	78	83	20	31	5	0	0	850	1	8.08	1.29	0.83	22.8	3.6	1.07	.302	3.46	77	3.16	75	8.38	25.7
4	Joe Ryan J. Ryan	5.79	161.2	2023	MIN	29	11	10	.524	29	4.51	197	1	1	0	155	81	83	32	34	6	0	0	672	3	10.97	1.89	1.78	29.3	5.1	1.17	.305	4.62	105	4.13	96	8.63	2.7
5	Zack Wheeler Z. Wheeler	5.44	192.0	2023	PHI	32	13	6	.684	32	3.61	212	0	0	0	168	77	82	20	39	9	0	0	787	1	9.94	1.83	0.94	26.9	5.0	1.08	.292	3.84	82	3.15	71	7.88	27.7
6	Braxton Garrett B. Garrett	5.38	159.2	2023	MIA	31	9	7	.563	30	3.66	156	0	0	0	154	65	68	20	29	11	1	0	659	4	8.79	1.63	1.13	23.7	4.4	1.15	.302	3.83	82	3.68	84	8.68	12.4
7	Logan Gilbert L. Gilbert	5.25	190.2	2023	SEA	32	12	7	.632	32	3.73	189	1	1	0	169	79	82	29	36	2	0	1	770	6	8.92	1.70	1.37	24.5	4.7	1.08	.272	3.87	93	3.84	94	7.98	5.6
8	Justin Steele J. Steele	4.89	173.1	2023	CHC	30	16	5	.762	30	3.06	176	0	0	0	167	59	71	14	36	7	0	0	716	9	9.14	1.87	0.73	24.6	5.0	1.17	.317	3.69	72	3.01	70	8.67	24.9
9	Pablo López P. López	4.88	194.0	2023	MIN	32	11	8	.579	32	3.66	234	1	1	0	176	79	81	24	48	9	0	1	801	7	10.86	2.23	1.11	29.2	6.0	1.15	.313	3.76	86	3.33	78	8.16	20.5
10	Spencer Strider S. Strider	4.84	186.2	2023	ATL	32	19	5	.792	32	3.86	281	0	0	0	146	80	85	22	58	9	0	1	763	6	13.55	2.80	1.06	36.8	7.6	1.09	.316	4.10	87	2.85	66	7.04	30.3
11	Zac Gallen Z. Gallen	4.68	210.0	2023	ARI	34	17	8	.680	34	3.47	220	1	1	0	188	81	87	22	47	5	0	0	846	8	9.43	2.01	0.94	26.0	5.6	1.12	.301	3.73	78	3.26	77	8.06	23.4
12	Gerrit Cole G. Cole	4.63	209.0	2023	NYY	33	15	4	.789	33	2.63	222	2	2	0	157	61	64	20	48	7	0	0	821	4	9.56	2.07	0.86	27.0	5.8	0.98	.261	2.76	61	3.16	72	6.76	28.4
13	Aaron Nola A. Nola	4.49	193.2	2023	PHI	32	12	9	.571	32	4.46	202	0	0	0	178	96	105	32	45	1	0	0	793	2	9.39	2.09	1.49	25.5	5.7	1.15	.285	4.88	102	4.03	90	8.27	9.4
14	Kevin Gausman K. Gausman	4.31	185.0	2023	TOR	31	12	9	.571	31	3.16	237	0	0	0	163	65	72	19	55	3	0	0	763	3	11.53	2.68	0.92	31.1	7.2	1.18	.321	3.50	75	2.97	69	7.93	27.1
15	Luis Castillo L. Castillo	3.91	197.0	2023	SEA	33	13	9	.591	33	3.34	219	0	0	0	160	73	81	28	56	5	0	0	802	3	10.01	2.56	1.28	27.3	7.0	1.10	.267	3.70	83	3.80	93	7.31	6.6
16	Freddy Peralta F. Peralta	3.89	165.2	2023	MIL	30	12	10	.545	30	3.86	210	0	0	0	131	71	77	26	54	6	0	0	680	6	11.41	2.93	1.41	30.9	7.9	1.12	.273	4.18	88	3.84	87	7.12	10.6
17	Max Scherzer M. Scherzer	3.87	152.2	2023	TOT	27	12	6	.667	27	3.77	174	0	0	0	126	64	65	28	45	4	0	0	621	2	10.26	2.65	1.65	28.0	7.2	1.12	.265	3.83	89	4.32	100	7.43	0.2
18	Mitch Keller M. Keller	3.82	194.1	2023	PIT	32	13	9	.591	32	4.21	210	1	1	0	187	91	97	25	55	12	0	0	825	5	9.73	2.55	1.16	25.5	6.7	1.25	.310	4.49	94	3.80	87	8.66	12.5
19	Kyle Bradish K. Bradish	3.82	168.2	2023	BAL	30	12	7	.632	30	2.83	168	0	0	0	132	53	54	14	44	8	0	0	671	9	8.96	2.35	0.75	25.0	6.6	1.04	.270	2.88	67	3.26	78	7.04	17.7
20	Jesús Luzardo J. Luzardo	3.78	178.2	2023	MIA	32	10	10	.500	32	3.58	208	0	0	0	162	71	79	22	55	6	0	1	741	7	10.48	2.77	1.11	28.1	7.4	1.21	.311	3.98	80	3.55	81	8.16	16.4
21	Yusei Kikuchi Y. Kikuchi	3.77	167.2	2023	TOR	32	11	6	.647	32	3.86	181	0	0	0	165	72	78	27	48	4	0	0	700	7	9.72	2.58	1.45	25.9	6.9	1.27	.314	4.19	91	4.12	96	8.86	3.1
22	Alex Cobb A. Cobb	3.54	151.1	2023	SFG	28	6	7	.462	28	3.87	131	2	1	0	163	65	69	19	37	6	0	0	646	7	7.79	2.20	1.13	20.3	5.7	1.32	.318	4.10	91	4.00	95	9.69	3.2
23	José Berríos J. Berríos	3.54	189.2	2023	TOR	32	11	12	.478	32	3.65	184	0	0	0	173	77	82	25	52	9	0	3	782	4	8.73	2.47	1.19	23.5	6.6	1.19	.289	3.89	86	3.99	93	8.21	6.1
24	Miles Mikolas M. Mikolas	3.51	201.1	2023	STL	35	9	13	.409	35	4.78	137	0	0	0	226	107	110	26	39	8	0	0	860	4	6.12	1.74	1.16	15.9	4.5	1.32	.308	4.92	111	4.27	100	10.10	0.2
25	Framber Valdez F. Valdez	3.51	198.0	2023	HOU	31	12	11	.522	31	3.45	200	2	2	0	166	76	86	19	57	10	0	0	808	6	9.09	2.59	0.86	24.8	7.1	1.13	.282	3.91	82	3.49	82	7.55	16.5