Riley O'Brien

#61 Active

RP ● St. Louis Cardinals ● 6'4" · 180 lbs ● Bats: R · Throws: R ● College of Idaho

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Season SV

Season ERA

4.14

Season WHIP

1.30

Season K

Season HLD

Next Matchup @ BOS Mon 1:05 PM ET

DFS Last 5

Game Log

2026 Regular Season

DATE	OPPONENT	DEC	IP	H	R	ER	HR	BB	SO	ERA	WHIP	PC	RESULT
Sep 20	vs. Washington Nationals	SV	1.0	0	0	0	0	0	0	3.88	1.23	6	W 3-5
Sep 19	vs. Washington Nationals		1.0	1	1	0	0	0	2	3.94	1.25	12	L 8-5
Sep 16	vs. San Francisco Giants	L	1.0	2	2	1	1	1	0	4.01	1.25	16	L 6-5
Sep 14	vs. San Francisco Giants	SV	1.0	1	0	0	0	1	2	3.92	1.22	19	W 1-2
Sep 12	vs. Chicago White Sox	L	1.0	1	2	2	1	1	2	3.99	1.21	21	L 6-5
Sep 11	vs. Chicago White Sox		1.0	0	0	0	0	0	1	3.75	1.20	11	W 3-7
Sep 7	@ San Francisco Giants	BS	1.0	1	1	0	0	2	0	3.81	1.22	11	L 4-5
Sep 4	@ Colorado Rockies	SV	1.0	1	0	0	0	0	2	3.88	1.19	12	W 7-6
Sep 3	@ Los Angeles Dodgers	L	0.1	2	2	2	0	1	0	3.95	1.19	17	L 2-3
Sep 2	@ Los Angeles Dodgers	SV	1.0	0	1	0	0	0	1	3.64	1.14	17	W 8-6
Aug 27	vs. Baltimore Orioles	SV	1.0	1	0	0	0	0	1	3.71	1.16	11	W 5-7
Aug 26	vs. Baltimore Orioles	L	1.0	2	1	1	0	0	0	3.78	1.17	17	L 8-7
Aug 23	@ Philadelphia Phillies	L	0.2	5	6	6	1	1	0	3.68	1.15	39	L 4-6
Aug 20	@ Cincinnati Reds	SV	0.1	1	0	0	0	2	0	2.66	1.05	15	W 10-9
Aug 18	@ Cincinnati Reds	SV	1.0	0	0	0	0	0	1	2.68	0.99	13	W 3-0
Aug 17	@ Cincinnati Reds	SV	1.0	0	0	0	0	0	3	2.74	1.01	14	W 2-1
Aug 15	@ Chicago Cubs		1.0	0	0	0	0	0	0	2.79	1.03	14	W 8-4
Aug 11	vs. Philadelphia Phillies	SV	1.0	0	0	0	0	0	1	2.85	1.06	8	W 0-2
Aug 9	vs. Colorado Rockies	SV	1.0	0	0	0	0	0	0	2.91	1.08	8	W 4-7
Aug 7	vs. Colorado Rockies	SV	1.0	0	0	0	0	1	0	2.98	1.10	14	W 2-3
Aug 5	@ New York Yankees	SV	1.0	0	0	0	0	1	1	3.05	1.11	22	W 3-1
Aug 2	@ Toronto Blue Jays		1.0	1	0	0	0	0	1	3.12	1.11	18	W 5-1
Jul 30	vs. Chicago Cubs		1.0	0	0	0	0	0	1	3.19	1.11	17	L 4-2
Jul 29	vs. Chicago Cubs		0.1	0	0	0	0	0	0	3.27	1.14	4	W 2-3
Jul 17	@ Arizona Diamondbacks		0.2	1	0	0	0	1	0	3.29	1.15	14	W 5-4
Jul 14	vs. AL American League		1.0	1	0	0	0	0	1	3.35	1.12	13	L 4-0
Jul 11	vs. Atlanta Braves	SV	1.0	0	0	0	0	1	1	3.43	1.12	18	W 1-4
Jul 10	vs. Atlanta Braves	SV	1.0	0	0	0	0	0	2	3.52	1.12	12	W 1-2
Jul 8	vs. Milwaukee Brewers		1.0	1	0	0	0	0	1	3.62	1.15	15	W 1-5
Jul 4	@ Chicago Cubs	SV	1.0	0	0	0	0	1	1	3.72	1.16	13	W 3-0
Jun 30	@ Atlanta Braves	SV	1.0	1	0	0	0	0	0	3.82	1.16	9	W 5-3
Jun 28	vs. Miami Marlins	SV	1.0	0	0	0	0	0	1	3.93	1.17	15	W 1-2
Jun 22	vs. Arizona Diamondbacks	SV	1.0	0	0	0	0	0	0	4.05	1.20	17	W 2-3
Jun 21	@ Kansas City Royals		1.0	2	2	2	1	0	1	4.18	1.24	12	W 12-10
Jun 16	vs. San Diego Padres	SV	1.0	0	0	0	0	1	0	3.73	1.21	13	W 2-3
Jun 13	@ Minnesota Twins		1.0	0	1	1	0	3	1	3.86	1.22	31	W 9-6
Jun 7	vs. Cincinnati Reds	SV	1.0	1	0	0	0	0	1	3.68	1.16	15	W 3-5
Jun 6	vs. Cincinnati Reds	SV	1.0	2	0	0	0	1	1	3.81	1.16	23	W 5-6
Jun 3	vs. Texas Rangers	SV	1.0	0	0	0	0	1	0	3.95	1.10	13	W 3-5
Jun 2	vs. Texas Rangers	L	1.0	3	3	3	0	1	2	4.10	1.10	32	L 7-4
May 29	vs. Chicago Cubs	SV	1.0	1	1	1	0	0	0	3.20	0.99	14	W 5-6
May 23	@ Cincinnati Reds	L	1.1	0	1	0	0	1	2	2.96	0.99	20	L 6-7
May 19	vs. Pittsburgh Pirates	BS	1.0	2	2	2	0	1	0	3.13	1.00	22	W 6-9
May 15	vs. Kansas City Royals		1.0	1	0	0	0	0	0	2.45	0.91	10	W 4-5
May 14	@ Las Vegas Athletics	SV	1.0	0	0	0	0	0	2	2.57	0.90	16	W 5-4
May 12	@ Las Vegas Athletics	SV	1.0	0	0	0	0	1	0	2.70	0.95	13	W 6-4
May 10	@ San Diego Padres	BS	1.0	2	2	2	1	0	3	2.84	0.95	31	L 2-3
May 7	@ San Diego Padres	SV	1.0	0	0	0	0	0	1	2.00	0.89	10	W 2-1
May 4	vs. Milwaukee Brewers	SV	0.2	0	0	0	0	0	0	2.12	0.94	3	W 3-6
May 2	vs. Los Angeles Dodgers	SV	1.0	4	2	2	0	0	2	2.20	0.98	26	W 2-3
Apr 29	@ Pittsburgh Pirates	SV	1.0	1	0	0	0	0	1	1.17	0.78	11	W 5-4
Apr 25	vs. Seattle Mariners	L	1.0	4	2	2	0	1	1	1.26	0.77	39	L 11-9
Apr 21	@ Miami Marlins	SV	1.0	1	0	0	0	0	1	0.00	0.45	17	W 5-3
Apr 19	@ Houston Astros	W	1.1	1	0	0	0	0	2	0.00	0.41	19	W 7-5
Apr 18	@ Houston Astros	SV	0.2	0	0	0	0	0	1	0.00	0.36	7	W 7-5
Apr 15	vs. Cleveland Guardians	SV	1.0	0	0	0	0	0	2	0.00	0.39	15	W 3-5
Apr 14	vs. Cleveland Guardians	W	1.0	0	0	0	0	0	1	0.00	0.43	15	W 5-6
Apr 10	vs. Boston Red Sox	SV	1.0	0	0	0	0	0	1	0.00	0.48	8	W 2-3
Apr 8	@ Washington Nationals		1.0	0	0	0	0	0	0	0.00	0.55	15	W 6-1
Apr 7	@ Washington Nationals	SV	1.0	0	1	0	0	0	2	0.00	0.63	16	W 7-6
Apr 5	@ Detroit Tigers	SV	1.0	0	0	0	0	0	1	0.00	0.75	13	W 5-3
Apr 1	vs. New York Mets		1.0	1	0	0	0	0	2	0.00	0.92	16	W 1-2
Mar 31	vs. New York Mets	SV	1.0	0	0	0	0	0	0	0.00	0.90	11	W 0-3
Mar 28	vs. Tampa Bay Rays	HLD	1.0	2	0	0	0	0	0	0.00	1.29	9	W 5-6
Mar 26	vs. Tampa Bay Rays	W	1.1	1	0	0	0	0	2	0.00	0.75	17	W 7-9
No games against that opponent.
Total		3-8	62.2	52	33	27	5	25	59	3.88	1.23	1,014
Total	1 game	0-0	1.0	1	0	0	0	0	1	0.00	1.00	13
Total	2 games	0-0	1.2	1	0	0	0	1	0	0.00	1.20	31
Total	3 games	0-0	3.0	1	0	0	0	1	3	0.00	0.67	39
Total	2 games	0-1	2.0	3	1	1	0	0	1	4.50	1.50	28
Total	1 game	0-0	1.0	0	0	0	0	0	1	0.00	0.00	8
Total	5 games	0-0	4.1	1	1	1	0	1	2	2.08	0.46	62
Total	2 games	0-1	2.0	1	2	2	1	1	3	9.00	1.00	32
Total	6 games	0-1	5.2	4	1	0	0	4	8	0.00	1.41	100
Total	2 games	1-0	2.0	0	0	0	0	0	3	0.00	0.00	30
Total	3 games	0-0	3.0	1	0	0	0	1	2	0.00	0.67	34
Total	1 game	0-0	1.0	0	0	0	0	0	1	0.00	0.00	13
Total	2 games	1-0	2.0	1	0	0	0	0	3	0.00	0.50	26
Total	2 games	0-0	2.0	3	2	2	1	0	1	9.00	1.50	22
Total	2 games	0-0	2.0	0	0	0	0	1	2	0.00	0.50	29
Total	3 games	0-1	2.1	6	5	4	0	1	3	15.43	3.00	60
Total	2 games	0-0	2.0	1	0	0	0	0	2	0.00	0.50	32
Total	2 games	0-0	1.2	1	0	0	0	0	1	0.00	0.60	18
Total	1 game	0-0	1.0	0	1	1	0	3	1	9.00	3.00	31
Total	2 games	0-0	2.0	1	0	0	0	0	2	0.00	0.50	27
Total	1 game	0-0	1.0	0	0	0	0	1	1	0.00	1.00	22
Total	2 games	0-1	1.2	5	6	6	1	1	1	32.40	3.60	47
Total	2 games	0-0	2.0	3	2	2	0	1	1	9.00	2.00	33
Total	3 games	0-0	3.0	2	2	2	1	1	4	6.00	1.00	54
Total	3 games	0-1	3.0	4	3	1	1	4	2	3.00	2.67	46
Total	1 game	0-1	1.0	4	2	2	0	1	1	18.00	5.00	39
Total	2 games	1-0	2.1	3	0	0	0	0	2	0.00	1.29	26
Total	2 games	0-1	2.0	3	3	3	0	2	2	13.50	2.50	45
Total	1 game	0-0	1.0	1	0	0	0	0	1	0.00	1.00	18
Total	4 games	0-0	4.0	1	2	0	0	0	4	0.00	0.25	49

AVG, OBP, SLG, ERA and WHIP are season-to-date through each game, not that game alone — so the column reads as a trend and its last value is the season figure. They stay season-to-date when the log is filtered by opponent; the figure for the filtered games is the one in the Total row. The second game of a doubleheader is marked (2).