Chase Dollander has allowed the most earned runs by a rookie this season, with 39 earned runs.

Interpreted as:

most earned runs allowed by a rookie this regular season

	NAME	ER	SEASON	TM	G	W	L	W%	GS	ERA	SO	CG	SHO	SV	IP	H	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	Chase Dollander C. Dollander	39	2025	COL	12	2	7	.222	12	6.19	48	0	0	0	56.2	59	43	14	25	2	0	0	252	1	7.62	3.97	1.92	2.22	19.0	9.9	1.48	.276	6.83	135	6.00	143	9.37	-10.8
2	Sean Burke S. Burke	38	2025	CWS	15	3	7	.300	13	4.50	61	0	0	0	76.0	73	44	11	35	4	0	0	333	2	7.22	4.14	1.74	1.30	18.3	10.5	1.42	.279	5.21	112	4.87	117	8.64	-5.7
3	Will Warren W. Warren	37	2025	NYY	15	4	4	.500	15	4.83	90	0	0	0	69.0	63	39	6	29	1	0	0	300	2	11.74	3.78	3.10	0.78	30.0	9.7	1.33	.328	5.09	122	2.88	69	8.22	9.7
4	Chad Patrick C. Patrick	31	2025	MIL	16	3	7	.300	15	3.50	76	0	0	0	79.2	76	31	8	26	4	0	1	337	0	8.59	2.94	2.92	0.90	22.6	7.7	1.28	.305	3.50	86	3.58	89	8.59	3.9
5	Jack Leiter J. Leiter	30	2025	TEX	12	4	4	.500	12	4.40	49	0	0	0	61.1	49	30	9	30	2	0	0	259	5	7.19	4.40	1.63	1.32	18.9	11.6	1.29	.237	4.40	111	4.93	119	7.19	-5.3
6	Tomoyuki Sugano T. Sugano	30	2025	BAL	14	5	4	.556	14	3.38	46	0	0	0	80.0	77	31	13	14	4	0	0	327	1	5.18	1.58	3.29	1.46	14.1	4.3	1.14	.256	3.49	87	4.69	118	8.66	-6.6
7	Ryan Gusto R. Gusto	26	2025	HOU	16	4	3	.571	10	4.31	60	0	0	0	54.1	60	29	7	23	2	1	0	246	0	9.94	3.81	2.61	1.16	24.4	9.3	1.53	.344	4.80	110	3.90	97	9.94	0.6
8	Noah Murdock N. Murdock	25	2025	ATH	14	1	1	.500	0	13.24	21	0	0	0	17.0	26	25	0	20	2	2	3	98	0	11.12	10.59	1.05	0.00	21.4	20.4	2.71	.473	13.24	333	4.46	110	13.76	-0.8
9	Connor Gillispie C. Gillispie	25	2025	MIA	6	0	3	.000	6	8.65	23	0	0	0	26.0	32	26	6	11	1	0	0	123	1	7.96	3.81	2.09	2.08	18.7	8.9	1.65	.317	9.00	209	5.67	142	11.08	-4.9
10	Gunnar Hoglund G. Hoglund	23	2025	ATH	6	1	3	.250	6	6.40	23	0	0	0	32.1	38	23	10	11	0	0	0	139	1	6.40	3.06	2.09	2.78	16.5	7.9	1.52	.295	6.40	161	6.67	165	10.58	-9.4
11	Kumar Rocker K. Rocker	23	2025	TEX	7	2	4	.333	7	7.31	27	0	0	0	28.1	40	24	4	8	2	0	0	134	4	8.58	2.54	3.38	1.27	20.1	6.0	1.69	.387	7.62	184	4.04	98	12.71	0.3
12	Bradley Blalock B. Blalock	23	2025	COL	5	0	2	.000	3	12.94	8	0	0	0	16.0	27	23	6	6	0	2	0	78	2	4.50	3.38	1.33	3.38	10.3	7.7	2.06	.362	12.94	282	8.05	193	15.19	-6.5
13	Jackson Jobe J. Jobe	23	2025	DET	10	4	1	.800	10	4.22	39	0	0	0	49.0	46	24	7	27	2	0	0	218	1	7.16	4.96	1.44	1.29	17.9	12.4	1.49	.273	4.41	107	5.09	127	8.45	-6
14	Hunter Dobbins H. Dobbins	23	2025	BOS	11	4	1	.800	9	3.74	42	0	0	0	55.1	55	24	6	11	2	0	1	228	0	6.83	1.79	3.82	0.98	18.4	4.8	1.19	.293	3.90	89	3.65	89	8.95	2.7
15	Carson Palmquist C. Palmquist	23	2025	COL	6	0	4	.000	6	7.76	18	0	0	0	26.2	31	24	7	16	3	0	0	129	1	6.08	5.40	1.13	2.36	14.0	12.4	1.76	.282	8.10	169	7.25	173	10.46	-8.6
16	Shane Smith S. Smith	23	2025	CWS	14	3	4	.429	14	2.85	66	0	0	0	72.2	59	31	4	30	8	0	0	310	5	8.17	3.72	2.20	0.50	21.3	9.7	1.22	.272	3.84	71	3.52	84	7.31	5.2
17	Brad Lord B. Lord	21	2025	WSH	26	1	5	.167	6	3.68	45	0	0	0	51.1	51	22	5	20	2	2	0	221	0	7.89	3.51	2.25	0.88	20.4	9.0	1.38	.309	3.86	92	3.85	96	8.94	1
18	Jackson Rutledge J. Rutledge	20	2025	WSH	24	1	1	.500	0	5.81	28	0	0	0	31.0	35	22	6	13	5	7	0	142	5	8.13	3.77	2.15	1.74	19.7	9.2	1.55	.322	6.39	145	5.50	137	10.16	-5
19	Angel Chivilli A. Chivilli	20	2025	COL	20	1	2	.333	0	6.14	21	0	0	0	29.1	34	23	6	13	1	1	1	134	4	6.44	3.99	1.62	1.84	15.7	9.7	1.60	.301	7.06	134	5.71	137	10.43	-4.7
20	Kyle Hart K. Hart	19	2025	SDP	6	2	2	.500	6	6.66	17	0	0	0	25.2	29	19	8	6	0	0	0	110	0	5.96	2.10	2.83	2.81	15.5	5.5	1.36	.266	6.66	171	6.48	164	10.17	-7.3
21	Matt Sauer M. Sauer	19	2025	LAD	9	2	1	.667	1	6.18	22	0	0	1	27.2	32	21	5	8	2	4	0	120	1	7.16	2.60	2.75	1.63	18.3	6.7	1.45	.325	6.83	155	4.90	121	10.41	-2.5
22	AJ Smith-Shawver	19	2025	ATL	9	3	2	.600	9	3.86	42	0	0	0	44.1	42	20	4	21	1	0	0	192	3	8.53	4.26	2.00	0.81	21.9	10.9	1.42	.306	4.06	94	3.82	98	8.53	0.4
23	Colton Gordon C. Gordon	18	2025	HOU	7	2	1	.667	7	4.54	34	0	0	0	35.2	44	19	8	5	1	0	2	154	1	8.58	1.26	6.80	2.02	22.1	3.2	1.37	.340	4.79	116	4.57	114	11.10	-2.3
24	Alek Jacob A. Jacob	18	2025	SDP	22	1	0	1.000	0	6.94	18	0	0	0	23.1	31	19	6	10	6	4	0	114	0	6.94	3.86	1.80	2.31	15.8	8.8	1.76	.338	7.33	178	6.91	175	11.96	-7.8
25	Elvin Rodríguez E. Rodríguez	18	2025	MIL	6	0	2	.000	2	8.68	17	0	0	0	18.2	23	18	7	7	1	3	0	84	0	8.20	3.38	2.43	3.38	20.2	8.3	1.61	.308	8.68	214	7.39	184	11.09	-6.9