most losses by a pitcher before turning 25

Red Ruffing has lost the most career games by a pitcher younger than 25, with 96 games.

Interpreted as:

most regular-season losses by a pitcher before turning 25 years old

	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	H/9
1	Red Ruffing R. Ruffing	96	39	.711	189	.289	138	4.64	453	73	5	9	1119.2	1,229	577	672	47	460	26	39		4,953	17	3.64	3.70	0.98	0.38	9.1	9.3	1.51	.298	5.40	9.88
2	Pete Schneider P. Schneider	86	59	.593	207	.407	157	2.64	487	85	10	5	1273.1	1,199		541	16	498	53	36			16	3.44	3.52	0.98	0.11		9.3	1.33	.274	3.82	8.47
3	Bert Blyleven B. Blyleven	85	95	.472	216	.528	213	2.78	1,327	97	24	0	1611.1	1,416	498	566	114	403	39	2	23	6,534	31	7.41	2.25	3.29	0.64	20.3	6.2	1.13	.280	3.16	7.91
4	Walter Johnson W. Johnson	81	110	.424	211	.576	182	0.08	1,156	158	31	6	1614.2	1,256		487	12	360	66	28			74	6.44	2.01	3.21	0.07		5.7	1.00	.261	2.71	7.00
5	Catfish Hunter C. Hunter	79	73	.520	212	.480	190	3.53	882	50	13	1	1319.1	1,170	518	574	151	424	24	4	29	5,471	22	6.02	2.89	2.08	1.03	16.1	7.7	1.21	.255	3.92	7.98
6	Earl Hamilton E. Hamilton	77	57	.575	195	.425	140	1.85	487	83	11	5	1221.0	1,149		556	19	442	49	37		5,086	25	3.59	3.26	1.10	0.14	9.6	8.7	1.30	.276	4.10	8.47
7	Pedro Ramos P. Ramos	75	56	.573	209	.427	131	4.44	414	36	6	9	1020.2	1,074	504	555	148	318	36	46	22	4,398	16	3.65	2.80	1.30	1.31	9.4	7.2	1.36	.266	4.89	9.47
8	Bullet Joe Bush B. Joe Bush	75	63	.543	180	.457	122	3.07	560	69	15	8	1080.1	967		484	15	485	23	45			40	4.67	4.04	1.15	0.12		10.5	1.34	.268	4.03	8.06
9	Dick Ellsworth D. Ellsworth	73	62	.541	180	.459	165	3.61	631	54	6	1	1121.2	1,118	450	512	106	347	16	5	34	4,730	34	5.06	2.78	1.82	0.85	13.3	7.3	1.31	.279	4.11	8.97
10	Clay Kirby C. Kirby	71	47	.602	158	.398	151	3.65	728	32	7	0	1003.0	894	407	458	96	466	20	4	44	4,293	40	6.53	4.18	1.56	0.86	17.0	10.9	1.36	.268	4.11	8.02
11	Hal Newhouser H. Newhouser	71	94	.430	231	.570	173	2.86	895	94	19	10	1376.1	1,165	438	537	38	673	6	43		5,852	29	5.85	4.40	1.33	0.25	15.3	11.5	1.34	.266	3.51	7.62
12	Larry Dierker L. Dierker	68	83	.450	205	.550	191	3.14	965	66	11	1	1409.0	1,268	491	556	109	386	22	5	29	5,797	64	6.16	2.47	2.50	0.70	16.6	6.7	1.17	.269	3.55	8.10
13	Mel Harder M. Harder	68	75	.476	236	.524	136	3.65	390	64	9	13	1198.0	1,299	486	619	45	393	26	61		5,246	13	2.93	2.95	0.99	0.34	7.4	7.5	1.41	.286	4.65	9.76
14	Mike McCormick M. McCormick	67	65	.508	249	.492	171	3.83	724	47	12	8	1223.0	1,198	521	584	135	439	11	35	43	5,206	39	5.33	3.23	1.65	0.99	13.9	8.4	1.34	.273	4.30	8.82
15	Camilo Pascual C. Pascual	66	28	.702	190	.298	100	4.66	565	22	4	8	790.0	813	409	441	70	356	24	54		3,487	21	6.44	4.06	1.59	0.80	16.2	10.2	1.48	.301	5.02	9.26
16	Jack Russell J. Russell	66	30	.688	172	.313	108	4.28	143	43	3	0	901.2	1,064	429	515	36	198	15	42		3,900	7	1.43	1.98	0.72	0.36	3.7	5.1	1.40	.293	5.14	10.62
17	Lee Meadows L. Meadows	66	52	.559	184	.441	132	3.01	395	58	7	5	1048.0	1,016		461	17	382	33	38			28	3.39	3.28	1.03	0.15		8.7	1.33	.280	3.96	8.73
18	Willis Hudlin W. Hudlin	65	65	.500	180	.500	132	3.96	266	67	4	9	1066.1	1,176	469	552	34	355	23	35		4,639	15	2.25	3.00	0.75	0.29	5.7	7.7	1.44	.288	4.66	9.93
19	Ray Sadecki R. Sadecki	63	65	.492	188	.508	162	4.20	636	41	5	4	1068.1	1,087	499	561	123	433	12	8	17	4,629	45	5.36	3.65	1.47	1.04	13.7	9.4	1.42	.281	4.73	9.16
20	Jim Shaw J. Shaw	63	51	.553	185	.447	116	2.82	519	53	13	6	981.1	801		391	9	478	16	49			34	4.76	4.38	1.09	0.08		11.6	1.30	.257	3.59	7.35
21	Jeremy Bonderman J. Bonderman	62	56	.525	157	.475	151	4.78	768	6	2	0	923.1	967	490	529	109	300	25	0	20	3,977	39	7.49	2.92	2.56	1.06	19.3	7.5	1.37	.309	5.16	9.43
22	Lefty Tyler L. Tyler	62	51	.549	149	.451	119	2.91	523	76	11	4	990.1	916		515	29	451	45	24			38	4.75	4.10	1.16	0.26		10.7	1.38	.279	4.68	8.32
23	Rick Wise R. Wise	61	56	.521	177	.479	137	3.75	550	34	9	0	947.0	1,008	395	459	63	246	21	10	22	4,016	17	5.23	2.34	2.24	0.60	13.7	6.1	1.32	.301	4.36	9.58
24	Don Sutton D. Sutton	60	51	.541	150	.459	137	3.28	757	35	11	2	959.1	863	350	375	68	259	14	8	36	3,951	21	7.10	2.43	2.92	0.64	19.2	6.6	1.17	.279	3.52	8.10
25	Milt Pappas M. Pappas	60	82	.423	198	.577	167	3.41	678	60	16	4	1186.0	1,046	450	495	100	437	28	21	22	4,936	54	5.15	3.32	1.55	0.76	13.7	8.9	1.25	.256	3.76	7.94