Jose DeLeon and Tim Leary were tied for losing the most games in 1990, with 19 games.

Interpreted as:

most pitching loses by a player 1990'2

	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	ERA-	FIP	FIP-	H/9	PRAA
1	Jose DeLeon J. DeLeon	19	1990	STL	7	.731	32	.269	32	4.43	164	0	0	0	182.2	168	90	96	15	86	5	0	9	793	5	8.08	4.24	1.91	0.74	20.7	10.8	1.39	.293	4.73	116	3.57	94	8.28	4.5
2	Tim Leary T. Leary	19	1990	NYY	9	.679	31	.321	31	4.11	138	6	1	0	208.0	202	95	105	18	78	7	0	1	881	23	5.97	3.38	1.77	0.78	15.7	8.9	1.35	.288	4.54	104	3.82	96	8.74	3.9
3	Allan Anderson A. Anderson	18	1990	MIN	7	.720	31	.280	31	4.53	82	5	1	0	188.2	214	95	106	20	39	5	0	1	797	4	3.91	1.86	2.10	0.95	10.3	4.9	1.34	.298	5.06	112	4.01	103	10.21	-2.1
4	Jack Morris J. Morris	18	1990	DET	15	.545	36	.455	36	4.51	162	11	3	0	249.2	231	125	144	26	97	6	0	13	1,073	16	5.84	3.50	1.67	0.94	15.1	9.0	1.31	.262	5.19	115	4.09	102	8.33	-1.5
5	Matt Young M. Young	18	1990	SEA	8	.692	34	.308	33	3.51	176	7	1	0	225.1	198	88	106	15	107	6	0	7	963	16	7.03	4.27	1.64	0.60	18.3	11.1	1.35	.278	4.23	88	3.61	90	7.91	9.5
6	Mark Langston M. Langston	17	1990	CAL	10	.630	33	.370	33	4.40	195	5	1	0	223.0	215	109	120	13	104	5	0	1	950	8	7.87	4.20	1.88	0.52	20.5	10.9	1.43	.319	4.84	115	3.27	83	8.68	16.6
7	Joe Magrane J. Magrane	17	1990	STL	10	.630	31	.370	31	3.59	100	3	2	0	203.1	204	81	86	10	59	8	0	7	855	11	4.43	2.61	1.69	0.44	11.7	6.9	1.29	.286	3.81	94	3.44	91	9.03	7.8
8	Todd Stottlemyre T. Stottlemyre	17	1990	TOR	13	.567	33	.433	33	4.34	115	4	0	0	203.0	214	98	101	18	69	8	0	4	866	6	5.10	3.06	1.67	0.80	13.3	8.0	1.39	.299	4.48	110	3.96	98	9.49	1.8
9	Greg Maddux G. Maddux	15	1990	CHC	15	.500	35	.500	35	3.46	144	8	2	0	237.0	242	91	116	11	71	4	0	10	1,011	3	5.47	2.70	2.03	0.42	14.2	7.0	1.32	.296	4.41	87	3.14	81	9.19	19
10	Mike Moore M. Moore	15	1990	OAK	13	.536	33	.464	33	4.65	73	3	0	0	199.1	204	103	113	14	84	3	0	2	862	13	3.30	3.79	0.87	0.63	8.5	9.7	1.44	.276	5.10	125	4.29	113	9.21	-11.7
11	Mike Morgan M. Morgan	15	1990	LAD	11	.577	33	.423	33	3.75	106	6	4	0	211.0	216	88	100	19	60	5	0	5	891	4	4.52	2.56	1.77	0.81	11.9	6.7	1.31	.281	4.27	101	3.89	105	9.21	-4.5
12	Dennis Rasmussen D. Rasmussen	15	1990	SDP	11	.577	32	.423	32	4.51	86	3	1	0	187.2	217	94	110	28	62	3	0	4	825	9	4.12	2.97	1.39	1.34	10.4	7.5	1.49	.293	5.28	118	4.86	125	10.41	-19.2
13	Jim Abbott J. Abbott	14	1990	CAL	10	.583	33	.417	33	4.51	105	4	1	0	211.2	246	106	116	16	72	5	0	6	925	4	4.46	3.06	1.46	0.68	11.4	7.8	1.50	.316	4.93	118	3.88	98	10.46	1.7
14	Sid Fernandez S. Fernandez	14	1990	NYM	9	.609	30	.391	30	3.46	181	2	1	0	179.1	130	69	79	18	67	5	0	4	735	1	9.08	3.36	2.70	0.90	24.6	9.1	1.10	.241	3.96	95	3.29	89	6.52	8.4
15	Bill Gullickson B. Gullickson	14	1990	HOU	10	.583	32	.417	32	3.82	73	2	1	0	193.1	221	82	100	21	61	2	0	14	846	3	3.40	2.84	1.20	0.98	8.6	7.2	1.46	.290	4.66	105	4.43	123	10.29	-19.4
16	Melido Perez M. Perez	14	1990	CWS	13	.519	35	.481	35	4.61	161	3	3	0	197.0	177	101	111	14	86	2	0	1	833	8	7.36	3.93	1.87	0.64	19.3	10.3	1.34	.286	5.07	118	3.43	90	8.09	8.8
17	Bruce Ruffin B. Ruffin	13	1990	PHI	6	.684	32	.316	25	5.38	79	2	1	0	149.0	178	89	99	14	62	1	1	7	678	3	4.77	3.74	1.27	0.85	11.7	9.1	1.61	.314	5.98	140	4.23	111	10.75	-6.6
18	Mike Scott M. Scott	13	1990	HOU	9	.591	32	.409	32	3.81	121	4	2	0	205.2	194	87	102	27	66	1	0	6	871	1	5.29	2.89	1.83	1.18	13.9	7.6	1.26	.255	4.46	105	4.31	120	8.49	-17.6
19	Fernando Valenzuela F. Valenzuela	13	1990	LAD	13	.500	33	.500	33	4.59	115	5	2	0	204.0	223	104	112	19	77	0	0	4	900	13	5.07	3.40	1.49	0.84	12.8	8.6	1.47	.296	4.94	124	4.02	108	9.84	-7.2
20	Chuck Cary C. Cary	12	1990	NYY	6	.667	28	.333	27	4.19	134	2	0	0	156.2	155	73	77	21	55	1	1	1	661	11	7.70	3.16	2.44	1.21	20.3	8.3	1.34	.298	4.42	106	3.90	98	8.90	1.6
21	Jim Deshaies J. Deshaies	12	1990	HOU	7	.632	34	.368	34	3.78	119	2	0	0	209.1	186	88	93	21	84	8	0	9	881	3	5.12	3.61	1.42	0.90	13.5	9.5	1.29	.254	4.00	104	4.29	119	8.00	-17.4
22	Tom Glavine T. Glavine	12	1990	ATL	10	.545	33	.455	33	4.28	129	1	0	0	214.1	232	102	111	18	78	1	0	10	929	8	5.42	3.28	1.65	0.76	13.9	8.4	1.45	.304	4.66	108	3.79	97	9.74	2.8
23	Kevin Gross K. Gross	12	1990	MON	9	.571	31	.429	26	4.57	111	2	1	0	163.1	171	83	86	9	65	4	3	7	712	4	6.12	3.58	1.71	0.50	15.6	9.1	1.44	.310	4.74	121	3.42	92	9.42	5.2
24	Andy Hawkins A. Hawkins	12	1990	NYY	5	.706	28	.294	26	5.37	74	2	1	0	157.2	156	94	101	20	82	2	1	3	692	2	4.22	4.68	0.90	1.14	10.7	11.8	1.51	.265	5.77	136	5.11	128	8.90	-19.1
25	Charlie Hough C. Hough	12	1990	TEX	12	.500	32	.500	32	4.07	114	5	0	0	218.2	190	99	108	24	119	11	0	2	950	4	4.69	4.90	0.96	0.99	12.0	12.5	1.41	.243	4.45	104	4.97	127	7.82	-25.7