Jesse Orosco had the most games pitched with an ERA of 0.00, with 925 games.

Interpreted as:

most regular-season games by a player with an era of 0

	NAME	G	ERA	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%	WHIP	BABIP	RA	H/9
1	Jesse Orosco J. Orosco	925	0.00	73	5	.936	0	909	0	0	133	968.0	436	0	20	0	339	23	403	51	3,618	28	8.45	3.15	2.68	0.00	25.1	9.4	0.80	.186	0.19	4.05
2	Mariano Rivera M. Rivera	907	0.00	57	5	.919	1	941	0	0	602	1008.1	482	0	10	0	174	29	811	13	3,649	5	8.40	1.55	5.41	0.00	25.8	4.8	0.65	.192	0.09	4.30
3	John Franco J. Franco	856	0.00	68	8	.895	0	764	0	0	383	957.0	558	0	40	0	294	10	609	43	3,650	32	7.18	2.76	2.60	0.00	20.9	8.1	0.89	.216	0.38	5.25
4	Mike Stanton M. Stanton	850	0.00	63	3	.955	1	689	0	0	74	858.2	455	0	19	0	221	19	284	36	3,181	18	7.22	2.32	3.12	0.00	21.7	6.9	0.79	.202	0.20	4.77
5	Trevor Hoffman T. Hoffman	815	0.00	45	6	.882	0	933	0	0	553	864.1	382	0	18	1	179	1	704	25	3,121	26	9.72	1.86	5.21	0.01	29.9	5.7	0.65	.190	0.19	3.98
6	Dan Plesac D. Plesac	771	0.00	50	5	.909	3	761	0	0	149	767.1	364	0	24	2	212	8	341	22	2,829	18	8.93	2.49	3.59	0.02	26.9	7.5	0.75	.196	0.28	4.27
7	Mike Timlin M. Timlin	761	0.00	63	2	.969	2	625	0	0	128	872.2	474	0	21	1	182	30	355	30	3,203	16	6.45	1.88	3.43	0.01	19.5	5.7	0.75	.200	0.22	4.89
8	Roberto Hernandez R. Hernandez	757	0.00	49	5	.907	0	726	0	0	293	800.1	453	0	38	0	262	23	518	28	3,065	26	8.16	2.95	2.77	0.00	23.7	8.5	0.89	.221	0.43	5.09
9	Kenley Jansen K. Jansen	754	0.00	43	0	1.000	0	1,075	0	0	427	767.0	284	0	10	0	187	24	586	11	2,782	12	12.61	2.19	5.75	0.00	38.6	6.7	0.61	.190	0.12	3.33
10	Kent Tekulve K. Tekulve	753	0.00	80	12	.870	0	583	0	0	165	1025.2	582	0	42	0	270	9	475	93	3,840	14	5.12	2.37	2.16	0.00	15.2	7.0	0.83	.195	0.37	5.11
11	Francisco Rodriguez F. Rodriguez	747	0.00	35	2	.946	0	918	0	0	391	771.0	333	0	13	0	258	12	555	27	2,865	42	10.72	3.01	3.56	0.00	32.0	9.0	0.77	.199	0.15	3.89
12	Lee Smith L. Smith	744	0.00	47	4	.922	0	921	0	0	436	927.2	471	0	23	1	257	6	633	42	3,438	21	8.94	2.49	3.58	0.01	26.8	7.5	0.78	.209	0.22	4.57
13	Michael Jackson M. Jackson	729	0.00	53	4	.930	0	727	0	0	128	848.1	418	0	23	0	241	30	336	32	3,157	19	7.71	2.56	3.02	0.00	23.0	7.6	0.78	.194	0.24	4.43
14	LaTroy Hawkins L. Hawkins	723	0.00	42	5	.894	3	546	0	0	116	745.1	457	0	25	1	155	6	291	11	2,776	23	6.59	1.87	3.52	0.01	19.7	5.6	0.82	.221	0.30	5.52
15	Todd Jones T. Jones	720	0.00	48	1	.980	0	657	0	0	282	799.1	431	0	21	0	248	22	486	30	3,010	16	7.40	2.79	2.65	0.00	21.8	8.2	0.85	.207	0.24	4.85
16	Aroldis Chapman A. Chapman	706	0.00	52	1	.981	0	1,149	0	0	333	699.2	223	0	15	0	250	21	476	1	2,555	40	14.78	3.22	4.60	0.00	45.0	9.8	0.68	.196	0.19	2.87
17	David Robertson D. Robertson	704	0.00	58	1	.983	1	970	0	0	167	729.0	314	0	8	1	233	16	291	17	2,700	36	11.98	2.88	4.16	0.01	35.9	8.6	0.75	.211	0.10	3.88
18	Fernando Rodney F. Rodney	699	0.00	38	7	.844	0	733	0	0	289	704.1	318	0	20	0	249	26	460	10	2,645	26	9.37	3.18	2.94	0.00	27.7	9.4	0.81	.194	0.26	4.06
19	Billy Wagner B. Wagner	699	0.00	34	1	.971	0	988	0	0	392	738.0	300	0	24	2	197	22	600	14	2,705	30	12.05	2.40	5.02	0.02	36.5	7.3	0.67	.199	0.29	3.66
20	Hoyt Wilhelm H. Wilhelm	694	0.00	106	14	.883	9	969	7	5	197	1303.2	595	0	76	2	379	31	493	27	4,802	43	6.69	2.62	2.56	0.01	20.2	7.9	0.75	.173	0.52	4.11
21	Craig Kimbrel C. Kimbrel	693	0.00	43	7	.860	0	1,082	0	0	414	684.0	251	0	15	0	214	29	564	4	2,511	38	14.24	2.82	5.06	0.00	43.1	8.5	0.68	.212	0.20	3.30
22	Joe Smith J. Smith	691	0.00	47	0	1.000	0	562	0	0	30	635.1	323	0	13	0	152	29	146	20	2,333	15	7.96	2.15	3.70	0.00	24.1	6.5	0.75	.203	0.18	4.58
23	Jose Mesa J. Mesa	681	0.00	42	4	.913	7	602	2	2	288	772.2	460	0	34	2	225	18	491	20	2,957	26	7.01	2.62	2.68	0.02	20.4	7.6	0.89	.217	0.40	5.36
24	Rich Gossage R. Gossage	668	0.00	92	8	.920	2	968	2	0	286	1056.2	508	0	29	0	325	19	519	48	3,912	22	8.24	2.77	2.98	0.00	24.7	8.3	0.79	.195	0.25	4.33
25	Javier Lopez J. Lopez	652	0.00	30	1	.968	0	315	0	0	14	457.1	226	0	17	0	123	15	140	22	1,671	11	6.20	2.42	2.56	0.00	18.9	7.4	0.76	.186	0.33	4.45