Jerry Koosman has lost the most career games for the Mets, with 137 games.

Interpreted as:

worst regular-season loss by a player in mets history

	NAME	L	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	Jerry Koosman J. Koosman	137	140	.495	376	.505	346	3.09	1,799	108	26	5	2544.2	2,281	875	994	187	820	49	14	92	10,517	66	6.36	2.90	2.19	0.66	17.1	7.8	1.22	.273	3.52	89	3.12	90	8.07	93.1
2	Tom Seaver T. Seaver	124	198	.385	401	.615	395	2.57	2,541	171	44	1	3045.2	2,431	870	953	212	847	52	5	70	12,191	81	7.51	2.50	3.00	0.63	20.8	6.9	1.08	.260	2.82	74	2.67	78	7.18	255.8
3	Dwight Gooden D. Gooden	85	157	.351	305	.649	303	3.10	1,875	67	23	1	2169.2	1,898	747	823	123	651	41	1	31	8,898	47	7.78	2.70	2.88	0.51	21.1	7.3	1.17	.286	3.41	86	2.76	75	7.87	217.6
4	Jon Matlack J. Matlack	81	82	.497	203	.503	199	3.03	1,023	65	26	0	1448.0	1,312	488	557	92	419	15	2	57	5,953	42	6.36	2.60	2.44	0.57	17.2	7.0	1.20	.277	3.46	87	2.88	82	8.15	100.6
5	Al Jackson A. Jackson	80	43	.650	184	.350	138	4.26	561	41	10	6	980.2	1,033	464	541	82	304	32	15	20	4,231	28	5.15	2.79	1.85	0.75	13.3	7.2	1.36	.292	4.96	120	3.51	101	9.48	-3.1
6	Sid Fernandez S. Fernandez	78	98	.443	255	.557	250	3.14	1,449	23	9	1	1584.2	1,167	553	601	138	596	36	1	27	6,456	20	8.23	3.38	2.43	0.78	22.4	9.2	1.11	.243	3.41	88	3.29	90	6.63	60.3
7	Jack Fisher J. Fisher	73	38	.658	160	.342	133	4.12	475	35	4	1	931.2	988	427	474	92	242	26	14	18	3,957	28	4.59	2.34	1.96	0.89	12.0	6.1	1.32	.287	4.58	119	3.68	110	9.54	-34.2
8	Craig Swan C. Swan	71	59	.546	229	.454	184	3.72	671	25	7	2	1230.2	1,191	508	569	112	368	11	15	38	5,140	7	4.91	2.69	1.82	0.82	13.1	7.2	1.27	.271	4.16	104	3.70	102	8.71	-12.7
9	Ron Darling R. Darling	70	99	.414	257	.586	241	3.50	1,148	25	10	0	1620.0	1,473	630	716	155	614	36	4	23	6,807	63	6.38	3.41	1.87	0.86	16.9	9.0	1.29	.272	3.98	99	3.80	105	8.18	-35.5
10	Al Leiter A. Leiter	67	95	.414	213	.586	213	3.42	1,106	10	7	0	1360.0	1,222	517	574	118	546	63	0	38	5,774	24	7.32	3.61	2.03	0.78	19.2	9.5	1.30	.280	3.80	82	3.91	91	8.09	60
11	Jonathon Niese J. Niese	62	61	.504	188	.496	179	3.99	838	3	2	0	1079.1	1,147	478	540	110	329	38	2	13	4,663	27	6.99	2.74	2.55	0.92	18.0	7.1	1.37	.310	4.50	107	3.88	101	9.56	-5.1
12	Steve Trachsel S. Trachsel	59	66	.472	160	.528	160	4.09	580	5	4	0	956.1	967	435	478	124	354	16	0	30	4,098	22	5.46	3.33	1.64	1.17	14.2	8.6	1.38	.279	4.50	98	4.67	109	9.10	-44.4
13	Jacob deGrom J. deGrom	57	82	.410	209	.590	209	2.52	1,607	4	2	0	1326.0	1,021	372	407	117	303	21	0	13	5,217	26	10.91	2.06	5.30	0.79	30.8	5.8	1.00	.285	2.76	65	2.61	64	6.93	216.2
14	Tom Glavine T. Glavine	56	61	.479	164	.521	164	3.97	516	4	3	0	1005.1	1,057	443	472	98	323	15	0	31	4,293	6	4.62	2.89	1.60	0.88	12.0	7.5	1.37	.287	4.23	94	4.34	100	9.46	-1.8
15	Bobby Jones B. Jones	56	74	.431	193	.569	190	4.13	714	10	4	0	1215.2	1,255	558	628	137	353	33	0	32	5,154	13	5.29	2.61	2.02	1.01	13.9	6.8	1.32	.285	4.65	100	4.36	103	9.29	-16.8
16	John Franco J. Franco	56	48	.538	695	.462	0	3.10	592	0	0	276	702.2	683	242	279	54	276	16	484	35	3,039	39	7.58	3.54	2.14	0.69	19.5	9.1	1.36	.299	3.57	77	3.59	87	8.75	42
17	Tug McGraw T. McGraw	55	47	.539	361	.461	36	3.17	618	5	1	86	792.2	685	279	316	64	350	13	228	67	3,345	44	7.02	3.97	1.77	0.73	18.5	10.5	1.31	.270	3.59	89	3.38	98	7.78	5.5
18	Mike Pelfrey M. Pelfrey	54	50	.519	153	.481	149	4.36	506	4	0	1	896.1	989	434	463	70	318	45	1	22	3,931	12	5.08	3.19	1.59	0.70	12.9	8.1	1.46	.307	4.65	109	4.19	103	9.93	-13.5
19	David Cone D. Cone	51	81	.386	187	.614	169	3.13	1,172	34	15	1	1209.1	1,011	421	472	91	431	28	4	23	5,008	62	8.72	3.21	2.72	0.68	23.4	8.6	1.19	.280	3.51	89	2.98	82	7.52	85.8
20	Jim McAndrew J. McAndrew	49	36	.576	146	.424	105	3.54	408	19	6	4	729.2	664	287	318	66	200	17	21	34	3,009	34	5.03	2.47	2.04	0.81	13.6	6.6	1.18	.258	3.92	100	3.45	101	8.19	-4.2
21	Jesse Orosco J. Orosco	47	47	.500	372	.500	4	2.73	506	0	0	107	595.2	480	181	207	40	240	12	246	36	2,465	13	7.65	3.63	2.11	0.60	20.5	9.7	1.21	.264	3.13	76	3.19	88	7.25	30
22	Pat Zachry P. Zachry	46	41	.529	135	.471	113	3.63	391	20	6	1	741.2	738	299	347	65	300	15	7	21	3,193	11	4.74	3.64	1.30	0.79	12.2	9.4	1.40	.278	4.21	103	4.03	113	8.96	-37.8
23	Roger Craig R. Craig	46	15	.754	88	.246	64	4.14	226	27	0	5	469.1	510	216	250	63	128	13	17	5	2,012	11	4.33	2.45	1.77	1.21	11.2	6.4	1.36	.283	4.79	110	4.23	115	9.78	-25.9
24	Galen Cisco G. Cisco	43	18	.705	126	.295	61	4.04	230	8	3	0	479.0	481	215	243	44	180	17	28	9	2,061	19	4.32	3.38	1.28	0.83	11.2	8.7	1.38	.275	4.57	116	4.01	118	9.04	-32
25	Gary Gentry G. Gentry	42	41	.506	131	.494	121	3.56	563	22	8	1	789.1	667	312	348	79	324	26	4	25	3,322	23	6.42	3.69	1.74	0.90	16.9	9.8	1.26	.252	3.97	100	3.70	108	7.61	-24.5