The Montreal Expos pitched their most innings in a game versus the Dodgers on August 23, 1989, with 22 innings.

Interpreted as:

most ip in a regular-season game as a washington senator

	TEAM	IP	DATE	TM		OPP	RESULT	ERA	SO	SHO	SV	H	ER	R	HR	BB	HBP	IBB	TBF	WP	K/9	BB/9	K/BB	HR/9	K%	BB%	WHIP	BABIP	RA	H/9
1	Expos	22.0	8/23/1989	MON	vs	LAD	L 0-1	0.41	17	0	0	20	1	1	1	0	0	0	81	0	6.95	0.00		0.41	21.0	0.0	0.91	.302	0.41	8.18
2	Expos	21.0	5/21/1977	MON	vs	SDP	L 8-11	3.43	12	0	0	13	8	11	3	13	0	4	87	0	5.14	5.57	0.92	1.29	13.8	14.9	1.24	.169	4.71	5.57
3	Expos	19.0	7/7/1985	MON	@	HOU	W 6-3	1.42	15	0	0	14	3	3	0	7	0	3	76	0	7.11	3.32	2.14	0.00	19.7	9.2	1.11	.259	1.42	6.63
4	Nationals	18.0	7/17/2016	WSH	vs	PIT	L 1-2	1.00	17	0	0	12	2	2	1	4	1	1	68	1	8.50	2.00	4.25	0.50	25.0	5.9	0.89	.244	1.00	6.00
5	Expos	18.0	6/28/1974	MON	vs	CHC	L 7-8	4.00	14	0	0	16	8	8	2	8	0	2	77	1	7.00	4.00	1.75	1.00	18.2	10.4	1.33	.264	4.00	8.00
6	Expos	18.0	6/27/1973	MON	@	CHC	W 5-4	2.00	6	0	0	13	4	4	3	7	0	0	72	2	3.00	3.50	0.86	1.50	8.3	9.7	1.11	.179	2.00	6.50
7	Expos	17.2	9/16/1975	MON	@	NYM	L 3-4	2.04	8	0	0	13	4	4	0	7	1	1	73	1	4.08	3.57	1.14	0.00	11.0	9.6	1.13	.228	2.04	6.62
8	Expos	17.0	8/11/1992	MON	@	CHC	W 3-2	1.06	12	0	0	11	2	2	1	4	0	1	62	0	6.35	2.12	3.00	0.53	19.4	6.5	0.88	.222	1.06	5.82
9	Expos	17.0	8/15/1990	MON	@	SDP	W 5-3	1.59	8	0	0	15	3	3	0	4	0	2	68	1	4.24	2.12	2.00	0.00	11.8	5.9	1.12	.268	1.59	7.94
10	Expos	17.0	4/19/1986	MON	vs	STL	L 6-9	3.18	12	0	0	16	6	9	1	9	0	3	75	0	6.35	4.76	1.33	0.53	16.0	12.0	1.47	.283	4.76	8.47
11	Expos	17.0	9/21/1981	MON	vs	PHI	W 1-0	0.00	4	0	0	8	0	0	0	8	1	0	63	0	2.12	4.24	0.50	0.00	6.3	12.7	0.94	.160	0.00	4.24
12	Expos	16.2	4/25/1992	MON	@	STL	L 1-2	1.08	8	0	0	15	2	2	1	7	0	4	69	0	4.32	3.78	1.14	0.54	11.6	10.1	1.32	.264	1.08	8.10
13	Expos	16.2	6/10/1983	MON	@	NYM	L 2-4	1.62	15	0	0	13	3	4	1	5	0	2	68	1	8.10	2.70	3.00	0.54	22.1	7.4	1.08	.255	2.16	7.02
14	Expos	16.2	7/9/1977	MON	@	NYM	L 5-7	3.78	9	0	0	12	7	7	2	3	0	1	64	2	4.86	1.62	3.00	1.08	14.1	4.7	0.90	.200	3.78	6.48
15	Nationals	16.0	4/24/2016	WSH	vs	MIN	W 6-5	2.81	20	0	0	11	5	5	1	3	0	1	62	0	11.25	1.69	6.67	0.56	32.3	4.8	0.88	.263	2.81	6.19
16	Nationals	16.0	6/24/2014	WSH	@	MIL	W 4-2	1.13	15	0	1	10	2	2	0	7	0	2	61	0	8.44	3.94	2.14	0.00	24.6	11.5	1.06	.256	1.13	5.63
17	Expos	16.0	6/17/1991	MON	vs	HOU	W 3-2	1.13	6	0	0	12	2	2	0	2	0	0	57	0	3.38	1.13	3.00	0.00	10.5	3.5	0.88	.245	1.13	6.75
18	Expos	16.0	5/2/1976	MON	@	CIN	W 8-4	2.25	6	0	0	18	4	4	1	5	1	2	71	0	3.38	2.81	1.20	0.56	8.5	7.0	1.44	.293	2.25	10.13
19	Expos	15.2	8/21/1976	MON	@	SFG	L 4-5	2.87	9	0	0	11	5	5	1	1	0	0	59	0	5.17	0.57	9.00	0.57	15.3	1.7	0.77	.208	2.87	6.32
20	Nationals	15.0	5/19/2014	WSH	vs	CIN	L 3-4	2.40	11	0	0	13	4	4	1	5	2	1	63	2	6.60	3.00	2.20	0.60	17.5	7.9	1.20	.273	2.40	7.80
21	Nationals	15.0	8/17/2013	WSH	@	ATL	W 8-7	4.20	20	0	1	9	7	7	4	7	1	0	60	3	12.00	4.20	2.86	2.40	33.3	11.7	1.07	.179	4.20	5.40
22	Nationals	15.0	10/4/2009	WSH	@	ATL	W 2-1	0.60	10	0	0	13	1	1	1	2	0	1	58	0	6.00	1.20	5.00	0.60	17.2	3.4	1.00	.267	0.60	7.80
23	Expos	15.0	4/24/2002	MON	vs	MIL	W 5-4	1.80	3	0	0	12	3	4	1	3	0	1	56	0	1.80	1.80	1.00	0.60	5.4	5.4	1.00	.224	2.40	7.20
24	Expos	15.0	4/26/2001	MON	@	STL	W 4-3	1.80	16	0	0	16	3	3	0	5	1	0	64	0	9.60	3.00	3.20	0.00	25.0	7.8	1.40	.381	1.80	9.60
25	Expos	15.0	9/12/1997	MON	@	NYM	W 3-2	1.20	11	0	1	12	2	2	0	5	2	0	63	0	6.60	3.00	2.20	0.00	17.5	7.9	1.13	.267	1.20	7.20