Kodai Senga pitched the most innings by a rookie in 2023, with 166.1 innings.

	NAME	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	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Kodai Senga K. Senga	166.1	2023	NYM	29	12	7	.632	29	2.98	202	0	0	0	126	55	60	17	77	5	0	0	694	14	10.93	4.17	2.62	0.92	29.1	11.1	1.22	.277	3.25	71	3.63	84	6.82	13
2	Hunter Brown H. Brown	155.2	2023	HOU	31	11	13	.458	29	5.09	178	0	0	0	157	88	94	26	55	9	1	0	665	4	10.29	3.18	3.24	1.50	26.8	8.3	1.36	.330	5.43	120	4.37	103	9.08	-2.3
3	Ryne Nelson R. Nelson	144.0	2023	ARI	29	8	8	.500	27	5.31	96	0	0	0	159	85	87	24	46	1	1	0	619	6	6.00	2.88	2.09	1.50	15.5	7.4	1.42	.299	5.44	120	5.06	119	9.94	-13.7
4	Tanner Bibee T. Bibee	142.0	2023	CLE	25	10	4	.714	25	2.98	141	0	0	0	122	47	49	13	45	5	0	0	585	7	8.94	2.85	3.13	0.82	24.1	7.7	1.18	.286	3.11	70	3.51	83	7.73	11.5
5	Ken Waldichuk K. Waldichuk	141.0	2023	OAK	35	4	8	.333	22	5.36	132	0	0	1	149	84	93	24	71	9	2	1	639	7	8.43	4.53	1.86	1.53	20.7	11.1	1.56	.310	5.94	131	5.29	127	9.51	-18.6
6	J.P. France	136.1	2023	HOU	24	11	6	.647	23	3.83	101	0	0	0	138	58	64	19	47	2	0	0	581	6	6.67	3.10	2.15	1.25	17.4	8.1	1.36	.289	4.22	90	4.66	110	9.11	-6.5
7	Bryce Miller B. Miller	131.1	2023	SEA	25	8	7	.533	25	4.32	119	0	0	0	124	63	64	18	26	7	0	0	537	2	8.15	1.78	4.58	1.23	22.2	4.8	1.14	.289	4.39	107	3.98	97	8.50	1.8
8	Logan Allen L. Allen	125.1	2023	CLE	24	7	8	.467	24	3.81	119	0	0	0	127	53	55	16	48	1	0	0	537	1	8.55	3.45	2.48	1.15	22.2	8.9	1.40	.314	3.95	90	4.19	99	9.12	0.7
9	Bobby Miller B. Miller	124.1	2023	LAD	22	10	4	.714	22	3.76	119	0	0	0	105	52	53	12	32	6	0	0	505	10	8.61	2.32	3.72	0.87	23.6	6.3	1.10	.277	3.84	88	3.51	79	7.60	13
10	Grayson Rodriguez G. Rodriguez	122.0	2023	BAL	23	7	4	.636	23	4.35	129	0	0	0	121	59	62	16	42	2	0	0	515	4	9.52	3.10	3.07	1.18	25.0	8.2	1.34	.322	4.57	104	3.92	94	8.93	3.7
11	Jake Irvin J. Irvin	121.0	2023	WSH	24	3	7	.300	24	4.61	99	0	0	0	118	62	66	20	54	8	0	0	530	2	7.36	4.02	1.83	1.49	18.7	10.2	1.42	.281	4.91	106	5.30	120	8.78	-11.7
12	Brandon Williamson B. Williamson	117.0	2023	CIN	23	5	4	.556	23	4.46	98	0	0	0	111	58	63	18	39	2	0	0	491	4	7.54	3.00	2.51	1.38	20.0	7.9	1.28	.278	4.85	96	4.63	100	8.54	0.4
13	Luis Medina L. Medina	109.2	2023	OAK	23	2	10	.167	17	5.42	106	0	0	0	109	66	73	14	57	8	0	2	495	11	8.70	4.68	1.86	1.15	21.4	11.5	1.51	.306	5.99	132	4.76	115	8.95	-7.7
14	Andrew Abbott A. Abbott	109.1	2023	CIN	21	8	5	.615	21	3.87	120	0	0	0	100	47	47	16	44	1	0	0	459	1	9.88	3.62	2.73	1.32	26.1	9.6	1.32	.302	3.87	83	4.19	90	8.23	5.3
15	Javier Assad J. Assad	109.1	2023	CHC	32	5	3	.625	10	3.05	94	0	0	0	93	37	38	13	41	3	9	1	449	3	7.74	3.38	2.29	1.07	20.9	9.1	1.23	.268	3.13	72	4.29	100	7.66	-0.1
16	Joey Wentz J. Wentz	105.2	2023	DET	25	3	13	.188	19	6.90	98	0	0	0	131	81	87	25	47	0	0	0	492	2	8.35	4.00	2.09	2.13	19.9	9.6	1.68	.329	7.41	163	5.81	137	11.16	-18.6
17	Taj Bradley T. Bradley	104.2	2023	TBR	23	5	8	.385	21	5.59	129	0	0	0	106	65	69	23	39	1	0	0	460	6	11.09	3.35	3.31	1.98	28.0	8.5	1.39	.310	5.93	136	4.79	115	9.11	-7.8
18	Reese Olson R. Olson	103.2	2023	DET	21	5	7	.417	18	3.99	103	0	0	0	83	46	49	14	33	1	0	0	422	4	8.94	2.86	3.12	1.22	24.4	7.8	1.12	.255	4.25	94	4.00	94	7.21	2.7
19	Cole Ragans C. Ragans	96.0	2023	TOT	29	7	5	.583	12	3.47	113	0	0	0	70	37	40	7	41	2	1	1	392	6	10.59	3.84	2.76	0.66	28.8	10.5	1.16	.275	3.75	79	3.19	74	6.56	11.9
20	Brandon Pfaadt B. Pfaadt	96.0	2023	ARI	19	3	8	.273	18	5.72	94	0	0	0	109	61	63	22	26	3	1	0	421	0	8.81	2.44	3.62	2.06	22.3	6.2	1.41	.315	5.91	129	5.18	122	10.22	-10.4
21	Xzavion Curry X. Curry	95.0	2023	CLE	41	3	4	.429	9	4.07	67	0	0	0	98	43	47	12	30	2	19	1	404	3	6.35	2.84	2.23	1.14	16.6	7.4	1.35	.294	4.45	96	4.49	106	9.28	-2.8
22	Eury Pérez E. Pérez	91.1	2023	MIA	19	5	6	.455	19	3.15	108	0	0	0	72	32	35	15	31	2	0	0	374	6	10.64	3.05	3.48	1.48	28.9	8.3	1.13	.261	3.45	71	4.11	94	7.09	2.7
23	Jhony Brito J. Brito	90.1	2023	NYY	25	9	7	.563	13	4.28	72	0	0	1	82	43	47	14	28	4	1	0	372	0	7.17	2.79	2.57	1.39	19.4	7.5	1.22	.268	4.68	100	4.74	107	8.17	-3.1
24	Hayden Wesneski H. Wesneski	89.1	2023	CHC	34	3	5	.375	11	4.63	83	0	0	0	82	46	50	20	32	3	6	1	379	2	8.36	3.22	2.59	2.01	21.9	8.4	1.28	.257	5.04	109	5.48	128	8.26	-12.1
25	Tommy Henry T. Henry	89.0	2023	ARI	17	5	3	.625	16	4.15	64	0	0	0	86	41	42	12	35	4	0	2	381	1	6.47	3.54	1.83	1.21	16.8	9.2	1.36	.278	4.25	94	4.88	115	8.70	-6.6