Jordan Luplow had the highest ERA with a WHIP under 0.90 in 2023, with an ERA of 13.50.

Interpreted as:

highest era by a player in MLB in 2023, whip < 0.90

	NAME	ERA	WHIP	SEASON	TM	G	W	L	W%	GS	SO	CG	SHO	SV	IP	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	BABIP	RA	ERA-	FIP	FIP-	H/9	PRAA
1	Jordan Luplow J. Luplow	13.50	0.75	2023	TOT	2	0	1	.000	0	0	0	0	0	1.1	1	2	3	1	0	1	2	0	6	1	0.00	0.00		6.75	0.0	0.0	.000	20.25	316	15.25	356	6.75	-1.6
2	Tyler Duffey T. Duffey	4.50	0.50	2023	CHC	1	0	0		0	3	0	0	0	2.0	1	1	1	1	0	0	0	0	7	0	13.50	0.00		4.50	42.9	0.0	.000	4.50	106	6.75	157	4.50	-0.6
3	Bennett Sousa B. Sousa	4.00	0.89	2023	TOT	7	0	0		0	10	0	0	0	9.0	6	4	4	1	2	0	4	0	34	0	10.00	2.00	5.00	1.00	29.4	5.9	.238	4.00	91	3.14	72	6.00	1.2
4	Mike Brosseau M. Brosseau	3.86	0.86	2023	MIL	3	0	0		0	0	0	0	0	2.1	1	1	1	1	1	0	3	0	9	0	0.00	3.86	0.00	3.86	0.0	11.1	.000	3.86	88	10.11	229	3.86	-1.5
5	Ty Adcock T. Adcock	3.45	0.70	2023	SEA	12	0	0		0	11	0	0	0	15.2	11	6	7	4	0	0	4	0	58	0	6.32	0.00		2.30	19.0	0.0	.163	4.02	86	5.17	126	6.32	-1.9
6	Robert Stephenson R. Stephenson	3.10	0.88	2023	TOT	60	3	4	.429	0	77	0	0	1	52.1	30	18	20	8	16	0	15	2	201	4	13.24	2.75	4.81	1.38	38.3	8.0	.220	3.44	73	3.21	76	5.16	6
7	Jonathan Loáisiga J. Loáisiga	3.06	0.85	2023	NYY	17	0	2	.000	0	6	0	0	0	17.2	14	6	7	2	1	2	4	1	69	0	3.06	0.51	6.00	1.02	8.7	1.4	.207	3.57	71	4.55	103	7.13	-0.3
8	Tarik Skubal T. Skubal	2.80	0.90	2023	DET	15	7	3	.700	15	102	0	0	0	80.1	58	25	28	4	14	3	0	0	310	1	11.43	1.57	7.29	0.45	32.9	4.5	.289	3.14	66	1.99	47	6.50	20.2
9	Jacob deGrom J. deGrom	2.67	0.76	2023	TEX	6	2	0	1.000	6	45	0	0	0	30.1	19	9	11	2	4	0	0	0	115	1	13.35	1.19	11.25	0.59	39.1	3.5	.266	3.26	62	1.54	35	5.64	9.4
10	John Means J. Means	2.66	0.72	2023	BAL	4	1	2	.333	4	10	0	0	0	23.2	13	7	7	4	4	1	0	0	88	0	3.80	1.52	2.50	1.52	11.4	4.5	.130	2.66	64	5.24	125	4.94	-2.8
11	Eduardo Escobar E. Escobar	2.45	0.82	2023	TOT	3	0	0		0	0	0	0	0	3.2	2	1	2	0	1	1	3	0	16	0	0.00	2.45	0.00	0.00	0.0	6.3	.143	4.91	56	4.89	111	4.91	-0.2
12	Ryan Borucki R. Borucki	2.45	0.74	2023	PIT	38	4	0	1.000	2	33	0	0	0	40.1	26	11	11	4	4	4	1	0	152	1	7.36	0.89	8.25	0.89	21.7	2.6	.206	2.45	55	3.50	80	5.80	3.9
13	Evan Phillips E. Phillips	2.35	0.85	2023	LAD	62	2	4	.333	0	66	0	0	23	61.1	39	16	19	6	13	3	36	2	234	1	9.68	1.91	5.08	0.88	28.2	5.6	.226	2.79	55	3.15	71	5.72	8.8
14	Brandon Woodruff B. Woodruff	2.28	0.82	2023	MIL	11	5	1	.833	11	74	1	1	0	67.0	40	17	17	9	15	3	0	0	253	0	9.94	2.01	4.93	1.21	29.2	5.9	.204	2.28	52	3.59	81	5.37	6.1
15	John McMillon J. McMillon	2.25	0.25	2023	KCR	4	0	0		0	8	0	0	0	4.0	1	1	1	1	0	0	3	0	13	0	18.00	0.00		2.25	61.5	0.0	.000	2.25	50	2.50	58	2.25	0.8
16	Ryan Pepiot R. Pepiot	2.14	0.76	2023	LAD	8	2	1	.667	3	38	0	0	0	42.0	27	10	10	7	5	3	0	0	159	0	8.14	1.07	7.60	1.50	23.9	3.1	.189	2.14	50	4.18	94	5.79	1.3
17	Tyler Holton T. Holton	2.11	0.87	2023	DET	59	3	2	.600	1	74	0	0	1	85.1	56	20	21	9	18	1	7	1	324	4	7.80	1.90	4.11	0.95	22.8	5.6	.212	2.21	50	3.56	84	5.91	6.5
18	Joey Krehbiel J. Krehbiel	1.80	0.80	2023	BAL	6	1	0	1.000	0	5	0	0	0	5.0	2	1	1	1	2	0	4	0	19	0	9.00	3.60	2.50	1.80	26.3	10.5	.091	1.80	43	5.05	120	3.60	-0.5
19	Bowden Francis B. Francis	1.73	0.83	2023	TOR	20	1	0	1.000	0	35	0	0	1	36.1	22	7	7	5	8	1	11	0	136	1	8.67	1.98	4.38	1.24	25.7	5.9	.195	1.73	41	3.86	90	5.45	1.7
20	Nick Nelson N. Nelson	1.69	0.75	2023	PHI	1	1	0	1.000	0	3	0	0	0	5.1	2	1	1	1	2	0	0	0	20	0	5.06	3.38	1.50	1.69	15.0	10.0	.071	1.69	39	5.69	127	3.38	-0.7
21	Joe Boyle J. Boyle	1.69	0.81	2023	OAK	3	2	0	1.000	3	15	0	0	0	16.0	8	3	4	1	5	0	0	0	60	0	8.44	2.81	3.00	0.56	25.0	8.3	.179	2.25	41	3.13	75	4.50	1.9
22	Tejay Antone T. Antone	1.59	0.88	2023	CIN	5	0	0		1	7	0	0	0	5.2	3	1	1	0	2	0	0	0	21	0	11.12	3.18	3.50	0.00	33.3	9.5	.250	1.59	34	1.84	40	4.76	1.7
23	Jeffrey Springs J. Springs	0.56	0.50	2023	TBR	3	2	0	1.000	3	24	0	0	0	16.0	4	1	1	1	4	0	0	0	55	0	13.50	2.25	6.00	0.56	43.6	7.3	.115	0.56	14	1.81	44	2.25	4.3