Since 1950, Vern Law has pitched the most innings in a game, with 18 innings versus the Milwaukee Braves on July 19, 1955.

Interpreted as:

most ip by a player in a regular-season game since 1950

	NAME	IP	DATE	TM		OPP	DEC	GS	ERA	SO	CG	SHO	SV	H	ER	R	HR	BB	HBP	GF	IBB	TBF	WP
1	Vern Law V. Law	18.0	7/19/1955	PIT	vs	MIL		1	0.50	12	0	0	0	9	1	2	1	2	0	0	0	64	1
2	Robin Roberts R. Roberts	17.0	9/6/1952	PHN	vs	BSN	W	1	2.65	5	1	0	0	18	5	6	1	3	0	0	1	71	0
3	Mickey McDermott M. McDermott	17.0	7/13/1951	BSA	@	CWS		1	1.06	9	0	0	0	8	2	2	0	9	0	0	0	68	1
4	Saul Rogovin S. Rogovin	17.0	7/12/1951	CWS	vs	BSA	L	1	2.12	9	1	0	0	10	4	5	1	6	0	0	0	63	0
5	Gaylord Perry G. Perry	16.0	9/1/1967	SFG	@	CIN		1	0.00	12	0	0	0	10	0	0	0	2	1	0	1	59	0
6	Juan Marichal J. Marichal	16.0	7/2/1963	SFG	vs	MIL	W	1	0.00	10	1	1	0	8	0	0	0	4	0	0	0	59	0
7	Tom Cheney T. Cheney	16.0	9/12/1962	WSH	@	BAL	W	1	0.56	21	1	0	0	10	1	1	0	4	0	0	0	62	1
8	Jerry Walker J. Walker	16.0	9/11/1959	BAL	vs	CWS	W	1	0.00	4	1	1	0	6	0	0	0	3	0	0	0	55	0
9	Billy Pierce B. Pierce	16.0	8/6/1959	CWS	@	BAL		1	0.56	7	0	0	0	11	1	1	0	3	0	0	2	61	0
10	Johnny Antonelli J. Antonelli	16.0	5/1/1955	NYG	vs	CIN	W	1	0.56	11	1	0	0	6	1	1	0	5	2	0	0	57	0
11	Jack Harshman J. Harshman	16.0	8/13/1954	CWS	vs	DET	W	1	0.00	12	1	1	0	9	0	0	0	7	0	0	0	65	0
12	Mickey McDermott M. McDermott	16.0	7/28/1951	BSA	vs	CLE	W	1	2.25	15	1	0	0	11	4	4	0	1	1	0	0	61	0
13	Warren Spahn W. Spahn	15.2	4/23/1951	BSN	@	BKN	L	1	0.57	8	1	0	0	10	1	2	1	2	0	0	1	56	0
14	Warren Spahn W. Spahn	15.1	7/2/1963	MIL	@	SFG	L	1	0.59	2	1	0	0	9	1	1	1	1	0	0	1	56	0
15	Bob Rush B. Rush	15.1	8/23/1957	CHC	@	NYG	L	1	1.76	10	1	0	0	11	3	3	0	2	0	0	1	58	0
16	Al Aber A. Aber	15.1	8/13/1954	DET	@	CWS	L	1	0.59	8	1	0	0	9	1	1	0	3	0	0	0	57	0
17	Gaylord Perry G. Perry	15.0	4/17/1974	CLE	@	MIL		1	2.40	14	0	0	0	8	4	4	1	4	0	0	0	55	0
18	Clay Kirby C. Kirby	15.0	9/24/1971	SDP	vs	HOU		1	0.60	15	0	0	0	8	1	1	1	3	0	0	0	55	0
19	Rob Gardner R. Gardner	15.0	10/2/1965	NYM	vs	PHI		1	0.00	7	0	0	0	5	0	0	0	2	0	0	0	53	0
20	Chris Short C. Short	15.0	10/2/1965	PHI	@	NYM		1	0.00	18	0	0	0	9	0	0	0	3	0	0	1	56	0
21	Al Jackson A. Jackson	15.0	8/14/1962	NYM	vs	PHI	L	1	1.20	6	1	0	0	6	2	3	0	5	1	0	1	57	0
22	Ray Moore R. Moore	15.0	5/21/1957	BAL	vs	DET		1	0.60	9	0	0	0	8	1	1	0	9	0	0	2	59	0
23	Robin Roberts R. Roberts	15.0	6/17/1954	PHN	vs	STL	W	1	1.20	7	1	0	0	10	2	2	1	0	0	0	0	54	0
24	Saul Rogovin S. Rogovin	15.0	9/14/1952	CWS	vs	BSA		1	1.80	14	0	0	0	12	3	3	2	4	0	0	0	57	0
25	Warren Spahn W. Spahn	15.0	6/14/1952	BSN	vs	CHC	L	1	1.80	18	1	0	0	10	3	3	1	2	0	0	1	57	0