Cole Ragans has the best K/9 this season, with 13.66 per nine innings.

Interpreted as:

strikeouts per 9 with a minimum of 1 IP per team game leaders 2025

	NAME	K/9	SEASON	TM	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	Cole Ragans C. Ragans	13.66	2025	KCR	5	1	1	.500	5	3.58	42	0	0	0	27.2	24	11	12	2	7	1	0	0	114	1	2.28	6.00	0.65	36.8	6.1	1.12	.355	3.90	87	1.80	45	7.81	6.7
2	Logan Gilbert L. Gilbert	12.71	2025	SEA	4	1	1	.500	4	2.38	32	0	0	0	22.2	11	6	6	3	4	0	0	0	84	2	1.59	8.00	1.19	38.1	4.8	0.66	.178	2.38	65	2.46	64	4.37	3.5
3	MacKenzie Gore M. Gore	12.52	2025	WSH	4	1	2	.333	4	3.52	32	0	0	0	23.0	23	9	9	2	6	1	0	0	95	1	2.35	5.33	0.78	33.7	6.3	1.26	.389	3.52	88	2.29	57	9.00	4.3
4	Chris Bassitt C. Bassitt	11.96	2025	TOR	4	2	0	1.000	4	0.77	31	0	0	0	23.1	20	2	2	0	5	0	0	0	93	2	1.93	6.20	0.00	33.3	5.4	1.07	.351	0.77	20	1.02	26	7.71	7.7
5	Eduardo Rodriguez E. Rodriguez	11.86	2025	AZ	4	1	2	.333	4	4.09	29	0	0	0	22.0	24	10	13	2	6	0	0	0	96	2	2.45	4.83	0.82	30.2	6.3	1.36	.373	5.32	101	2.40	63	9.82	3.6
6	Yoshinobu Yamamoto Y. Yamamoto	11.79	2025	LAD	5	3	1	.750	5	0.93	38	0	0	0	29.0	18	3	4	2	7	0	0	0	108	1	2.17	5.43	0.62	35.2	6.5	0.86	.262	1.24	24	2.03	50	5.59	6.3
7	Zack Wheeler Z. Wheeler	11.78	2025	PHI	5	2	1	.667	5	3.73	41	0	0	0	31.1	25	13	13	5	6	1	0	0	122	0	1.72	6.83	1.44	33.6	4.9	0.99	.290	3.73	93	3.16	78	7.18	3
8	Carlos Rodón C. Rodón	11.48	2025	NYY	5	2	3	.400	5	4.34	37	0	0	0	29.0	16	14	15	5	16	0	0	0	116	1	4.97	2.31	1.55	31.9	13.8	1.10	.190	4.66	111	4.38	107	4.97	-0.9
9	Cristopher Sánchez C. Sánchez	11.47	2025	PHI	4	2	0	1.000	4	2.96	31	0	0	0	24.1	22	8	9	4	6	2	0	0	101	1	2.22	5.17	1.48	30.7	5.9	1.15	.310	3.33	74	3.61	90	8.14	1.1
10	Logan Webb L. Webb	11.40	2025	SFG	5	2	1	.667	5	2.40	38	0	0	0	30.0	24	8	9	1	7	0	0	0	116	1	2.10	5.43	0.30	32.8	6.0	1.03	.329	2.70	62	1.63	43	7.20	7.4
11	Chris Sale C. Sale	11.37	2025	ATL	4	0	2	.000	4	6.63	24	0	0	0	19.0	25	14	15	3	4	3	0	0	88	1	1.89	6.00	1.42	27.3	4.5	1.53	.407	7.11	163	3.66	95	11.84	0.4
12	Jesús Luzardo J. Luzardo	11.19	2025	PHI	4	2	0	1.000	4	2.31	29	0	0	0	23.1	18	6	6	1	7	0	0	0	91	0	2.70	4.14	0.39	31.9	7.7	1.07	.315	2.31	58	2.00	50	6.94	5.2
13	David Peterson D. Peterson	10.64	2025	NYM	4	1	1	.500	4	3.27	26	0	0	0	22.0	22	8	8	2	8	1	0	0	94	1	3.27	3.25	0.82	27.7	8.5	1.36	.351	3.27	85	3.08	79	9.00	2
14	Dylan Cease D. Cease	10.62	2025	SDP	4	1	1	.500	4	6.64	24	0	0	0	20.1	24	15	16	2	7	0	0	1	91	0	3.10	3.43	0.89	26.4	7.7	1.52	.379	7.08	172	2.98	76	10.62	2.1
15	Jack Flaherty J. Flaherty	10.55	2025	DET	4	1	1	.500	4	2.53	25	0	0	0	21.1	14	6	6	2	9	1	0	0	87	0	3.80	2.78	0.84	28.7	10.3	1.08	.240	2.53	66	3.31	84	5.91	1.5
16	Max Fried M. Fried	10.50	2025	NYY	4	3	0	1.000	4	1.88	28	0	0	0	24.0	23	5	9	2	5	2	0	0	105	0	1.88	5.60	0.75	26.7	4.8	1.17	.309	3.38	48	2.66	65	8.63	3.7
17	Freddy Peralta F. Peralta	10.48	2025	MIL	5	2	1	.667	5	1.91	33	0	0	0	28.1	20	6	6	3	9	1	0	0	114	1	2.86	3.67	0.95	28.9	7.9	1.02	.250	1.91	47	3.14	79	6.35	2.7
18	Aaron Nola A. Nola	10.38	2025	PHI	4	0	4	.000	4	6.65	25	0	0	0	21.2	27	16	17	4	9	1	0	0	100	1	3.74	2.78	1.66	25.0	9.0	1.66	.377	7.06	165	4.51	112	11.22	-1.1
19	Brady Singer B. Singer	10.13	2025	CIN	4	3	0	1.000	4	3.38	24	0	0	0	21.1	17	8	12	2	9	0	0	0	90	0	3.80	2.67	0.84	26.7	10.0	1.22	.273	5.06	79	3.27	78	7.17	2.1
20	Zac Gallen Z. Gallen	10.13	2025	AZ	4	1	2	.333	4	4.64	24	0	0	0	21.1	19	11	11	3	11	1	0	0	95	1	4.64	2.18	1.27	25.3	11.6	1.41	.286	4.64	114	4.30	112	8.02	-1.2
21	Max Meyer M. Meyer	10.13	2025	MIA	4	1	2	.333	4	2.63	27	0	0	0	24.0	20	7	8	3	7	1	0	0	98	0	2.63	3.86	1.13	27.6	7.1	1.13	.283	3.00	64	3.41	86	7.50	1.4
22	Kris Bubic K. Bubic	10.13	2025	KCR	4	2	1	.667	4	1.88	27	0	0	0	24.0	20	5	7	1	9	2	0	1	103	0	3.38	3.00	0.38	26.2	8.7	1.21	.297	2.63	46	2.70	68	7.50	3.4
23	Hunter Greene H. Greene	10.08	2025	CIN	4	2	1	.667	4	0.98	31	0	0	0	27.2	12	3	3	1	4	0	0	0	99	2	1.30	7.75	0.33	31.3	4.0	0.58	.175	0.98	23	1.70	40	3.90	7.3
24	Framber Valdez F. Valdez	9.82	2025	HOU	4	1	2	.333	4	4.91	24	0	0	0	22.0	20	12	12	2	8	2	0	0	94	1	3.27	3.00	0.82	25.5	8.5	1.27	.310	4.91	127	3.40	86	8.18	1.3
25	Ryan Pepiot R. Pepiot	9.82	2025	TBR	4	1	2	.333	4	4.91	24	0	0	0	22.0	26	12	13	6	9	1	0	0	102	2	3.68	2.67	2.45	23.5	8.8	1.59	.323	5.32	131	5.76	149	10.64	-4.8