Jordan Lyles lost the most games by a starting pitcher in 2023, with 17 games.

	NAME	L	SEASON	TM	W	L%	G	W%	GS	ERA	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%	WHIP	BABIP	RA	H/9
1	Jordan Lyles J. Lyles	17	2023	KCR	6	.739	31	.261	31	6.28	120	3	0	0	177.2	176	124	130	39	45	6	0	0	748	10	6.08	2.28	2.67	1.98	16.0	6.0	1.24	.255	6.59	8.92
2	Lucas Giolito L. Giolito	15	2023	TOT	7	.682	33	.318	33	4.88	204	0	0	0	184.1	169	100	110	41	73	9	0	2	794	5	9.96	3.56	2.79	2.00	25.7	9.2	1.31	.274	5.37	8.25
3	Patrick Corbin P. Corbin	15	2023	WSH	10	.600	32	.400	32	5.20	124	0	0	0	180.0	210	104	113	33	57	4	0	0	790	6	6.20	2.85	2.18	1.65	15.7	7.2	1.48	.309	5.65	10.50
4	Johan Oviedo J. Oviedo	14	2023	PIT	9	.609	32	.391	32	4.31	158	1	1	0	177.2	161	85	91	19	83	13	0	1	781	7	8.00	4.20	1.90	0.96	20.2	10.6	1.37	.280	4.61	8.16
5	Rich Hill R. Hill	14	2023	TOT	7	.667	27	.333	27	5.57	120	0	0	0	135.2	155	84	91	23	53	6	0	0	613	2	7.96	3.52	2.26	1.53	19.6	8.6	1.53	.321	6.04	10.28
6	Kyle Freeland K. Freeland	14	2023	COL	5	.737	29	.263	29	5.03	94	0	0	0	155.2	187	87	96	29	42	1	0	0	677	2	5.43	2.43	2.24	1.68	13.9	6.2	1.47	.309	5.55	10.81
7	Hunter Brown H. Brown	13	2023	HOU	10	.565	29	.435	29	5.19	177	0	0	0	152.2	156	88	94	26	53	9	0	0	654	4	10.43	3.12	3.34	1.53	27.1	8.1	1.37	.334	5.54	9.20
8	Patrick Sandoval P. Sandoval	13	2023	LAA	7	.650	28	.350	28	4.35	128	0	0	0	144.2	146	70	89	12	74	4	0	2	652	5	7.96	4.60	1.73	0.75	19.6	11.3	1.52	.309	5.54	9.08
9	Josiah Gray J. Gray	13	2023	WSH	8	.619	30	.381	30	3.91	143	0	0	0	159.0	152	69	72	22	80	9	0	1	698	9	8.09	4.53	1.79	1.25	20.5	11.5	1.46	.293	4.08	8.60
10	Zack Greinke Z. Greinke	13	2023	KCR	2	.867	27	.133	27	5.02	88	0	0	0	131.0	145	73	75	23	21	3	0	0	543	2	6.05	1.44	4.19	1.58	16.2	3.9	1.27	.299	5.15	9.96
11	Miles Mikolas M. Mikolas	13	2023	STL	9	.591	35	.409	35	4.78	137	0	0	0	201.1	226	107	110	26	39	8	0	0	860	4	6.12	1.74	3.51	1.16	15.9	4.5	1.32	.308	4.92	10.10
12	JP Sears	12	2023	OAK	5	.706	32	.294	32	4.54	161	0	0	0	172.1	165	87	90	34	53	16	0	2	735	2	8.41	2.77	3.04	1.78	21.9	7.2	1.26	.278	4.70	8.62
13	José Berríos J. Berríos	12	2023	TOR	11	.522	32	.478	32	3.65	184	0	0	0	189.2	173	77	82	25	52	9	0	3	782	4	8.73	2.47	3.54	1.19	23.5	6.6	1.19	.289	3.89	8.21
14	Michael Kopech M. Kopech	12	2023	CWS	5	.706	27	.294	27	5.12	130	0	0	0	126.2	108	72	74	28	89	11	0	0	573	9	9.24	6.32	1.46	1.99	22.7	15.5	1.56	.254	5.26	7.67
15	Charlie Morton C. Morton	12	2023	ATL	14	.462	30	.538	30	3.64	183	0	0	0	163.1	150	66	70	14	83	12	0	2	716	4	10.08	4.57	2.20	0.77	25.6	11.6	1.43	.321	3.86	8.27
16	Sandy Alcantara S. Alcantara	12	2023	MIA	7	.632	28	.368	28	4.14	151	3	1	0	184.2	176	85	91	22	48	5	0	0	762	4	7.36	2.34	3.15	1.07	19.8	6.3	1.21	.287	4.44	8.58
17	Adam Wainwright A. Wainwright	11	2023	STL	5	.688	21	.313	21	7.40	55	0	0	0	101.0	151	83	89	20	41	1	0	0	484	1	4.90	3.65	1.34	1.78	11.4	8.5	1.90	.357	7.93	13.46
18	Brayan Bello B. Bello	11	2023	BOS	12	.478	28	.522	28	4.24	132	0	0	0	157.0	165	74	77	24	45	6	0	0	668	1	7.57	2.58	2.93	1.38	19.8	6.7	1.34	.306	4.41	9.46
19	Brady Singer B. Singer	11	2023	KCR	8	.579	29	.421	29	5.52	133	0	0	0	159.2	182	98	102	20	49	8	0	0	702	3	7.50	2.76	2.71	1.13	18.9	7.0	1.45	.329	5.75	10.26
20	Jordan Montgomery J. Montgomery	11	2023	TOT	10	.524	32	.476	32	3.20	166	0	0	0	188.2	177	67	75	18	48	4	0	0	777	6	7.92	2.29	3.46	0.86	21.4	6.2	1.19	.294	3.58	8.44
21	Joey Wentz J. Wentz	11	2023	DET	1	.917	19	.083	19	7.73	70	0	0	0	80.1	113	69	75	19	38	0	0	0	391	2	7.84	4.26	1.84	2.13	17.9	9.7	1.88	.356	8.40	12.66
22	Lance Lynn L. Lynn	11	2023	TOT	13	.458	32	.542	32	5.73	191	0	0	0	183.2	189	117	127	44	67	9	0	1	808	3	9.36	3.28	2.85	2.16	23.6	8.3	1.39	.292	6.22	9.26
23	Logan Webb L. Webb	11	2023	SFG	10	.524	33	.476	33	3.25	194	2	1	0	216.0	201	78	83	20	31	5	0	0	850	1	8.08	1.29	6.26	0.83	22.8	3.6	1.07	.302	3.46	8.38
24	Framber Valdez F. Valdez	11	2023	HOU	12	.478	31	.522	31	3.45	200	2	2	0	198.0	166	76	86	19	57	10	0	0	808	6	9.09	2.59	3.51	0.86	24.8	7.1	1.13	.282	3.91	7.55
25	Yu Darvish Y. Darvish	10	2023	SDP	8	.556	24	.444	24	4.56	141	0	0	0	136.1	134	69	71	18	43	8	0	0	574	1	9.31	2.84	3.28	1.19	24.6	7.5	1.30	.319	4.69	8.85