Riley O'Brien

2026 seasonregular season

Bats/Throws: R/R
Height: 6' 4"
Weight: 180 lb
Age: 31
Born: Seattle, WA, USA
MLB debut: 2021-09-28
Drafted: 2017

Pitch qualityour Stuff+ grades

How nasty each pitch is from its physical shape alone — velocity, spin, movement, extension and release point — on a scale where 100 is league average and every 10 points is one standard deviation. It does not see where the pitch was thrown, the count, or what happened to it, so a pitcher with great stuff and poor command can still give up runs. How it is built

109overall

Sinker114
Slider108
Sweeper104

Pitching

Season	G	GS	IP	ERA	WHIP	K	BB	HR	K/9	W-L	SV
2026	66	0	64.0	4.08	1.28	64	29	5	9.00	3-9	38

Last 10 games

Game	Dec	IP	H	ER	BB	K	HR	P
09/20vWSHW	SV	1.0	0	0	0	0	0	6
09/19vWSHL		1.0	1	0	0	2	0	12
09/16vSFL	L	1.0	2	1	1	0	1	16
09/14vSFW	SV	1.0	1	0	1	2	0	19
09/12vCWSL	L	1.0	1	2	1	2	1	21
09/11vCWSW		1.0	0	0	0	1	0	11
09/07@SFL		1.0	1	0	2	0	0	11
09/04@COLW	SV	1.0	1	0	0	2	0	12
09/03@LADL	L	0.1	2	2	1	0	0	17
09/02@LADW	SV	1.0	0	0	0	1	0	17

Full 2026 game log (66 games)

Game	Dec	IP	H	ER	BB	K	HR	P
09/20vWSHW	SV	1.0	0	0	0	0	0	6
09/19vWSHL		1.0	1	0	0	2	0	12
09/16vSFL	L	1.0	2	1	1	0	1	16
09/14vSFW	SV	1.0	1	0	1	2	0	19
09/12vCWSL	L	1.0	1	2	1	2	1	21
09/11vCWSW		1.0	0	0	0	1	0	11
09/07@SFL		1.0	1	0	2	0	0	11
09/04@COLW	SV	1.0	1	0	0	2	0	12
09/03@LADL	L	0.1	2	2	1	0	0	17
09/02@LADW	SV	1.0	0	0	0	1	0	17
08/27vBALW	SV	1.0	1	0	0	1	0	11
08/26vBALL	L	1.0	2	1	0	0	0	17
08/23@PHIL	L	0.2	5	6	1	0	1	39
08/20@CINW	SV	0.1	1	0	2	0	0	15
08/18@CINW	SV	1.0	0	0	0	1	0	13
08/17@CINW	SV	1.0	0	0	0	3	0	14
08/15@CHCW		1.0	0	0	0	0	0	14
08/11vPHIW	SV	1.0	0	0	0	1	0	8
08/09vCOLW	SV	1.0	0	0	0	0	0	8
08/07vCOLW	SV	1.0	0	0	1	0	0	14
08/05@NYYW	SV	1.0	0	0	1	1	0	22
08/02@TORW		1.0	1	0	0	1	0	18
07/30vCHCL		1.0	0	0	0	1	0	17
07/29vCHCW		1.0	0	0	1	1	0	18
07/22@LAAW	SV	1.0	0	0	2	3	0	26
07/20@LAAL	L	0.1	2	2	1	1	0	21
07/17@AZW	SV	1.0	1	0	1	1	0	16
07/11vATLW	SV	1.0	0	0	1	1	0	18
07/10vATLW	SV	1.0	0	0	0	2	0	12
07/08vMILW		1.0	1	0	0	1	0	15
07/04@CHCW	SV	1.0	0	0	1	1	0	13
06/30@ATLW	SV	1.0	1	0	0	0	0	9
06/28vMIAW	SV	1.0	0	0	0	1	0	15
06/22vAZW	SV	1.0	0	0	0	0	0	17
06/21@KCW		1.0	2	2	0	1	1	12
06/16vSDW	SV	1.0	0	0	1	0	0	13
06/13@MINW		1.0	0	1	3	1	0	31
06/07vCINW	SV	1.0	1	0	0	1	0	15
06/06vCINW	SV	1.0	2	0	1	1	0	23
06/03vTEXW	SV	1.0	0	0	1	0	0	13
06/02vTEXL	L	1.0	3	3	1	2	0	32
05/29vCHCW	SV	1.0	1	1	0	0	0	14
05/23@CINL	L	1.1	0	0	1	2	0	20
05/19vPITW		1.0	2	2	1	0	0	22
05/15vKCW		1.0	1	0	0	0	0	10
05/14@ATHW	SV	1.0	0	0	0	2	0	16
05/12@ATHW	SV	1.0	0	0	1	0	0	13
05/10@SDL		1.0	2	2	0	3	1	31
05/07@SDW	SV	1.0	0	0	0	1	0	10
05/04vMILW	SV	0.2	0	0	0	0	0	3
05/02vLADW	SV	1.0	4	2	0	2	0	26
04/29@PITW	SV	1.0	1	0	0	1	0	11
04/25vSEAL	L	1.0	4	2	1	1	0	39
04/21@MIAW	SV	1.0	1	0	0	1	0	17
04/19@HOUW	W	1.1	1	0	0	2	0	19
04/18@HOUW	SV	0.2	0	0	0	1	0	7
04/15vCLEW	SV	1.0	0	0	0	2	0	15
04/14vCLEW	W	1.0	0	0	0	1	0	15
04/10vBOSW	SV	1.0	0	0	0	1	0	8
04/08@WSHW		1.0	0	0	0	0	0	15
04/07@WSHW	SV	1.0	0	0	0	2	0	16
04/05@DETW	SV	1.0	0	0	0	1	0	13
04/01vNYMW		1.0	1	0	0	2	0	16
03/31vNYMW	SV	1.0	0	0	0	0	0	11
03/28vTBW	HLD	1.0	2	0	0	0	0	9
03/26vTBW	W	1.1	1	0	0	2	0	17

Career by season

Season	G	GS	IP	ERA	WHIP	K	BB	HR	K/9	W-L	SV
2021CIN	1	1	1.1	13.50	3.75	2	3	2	13.50	0-1	0
2022SEA	1	0	1.0	0.00	2.00	1	1	0	9.00	0-0	0
2024STL	8	0	8.0	11.25	2.63	11	8	2	12.38	0-0	0
2025STL	42	0	48.0	2.06	1.15	45	22	2	8.44	3-1	6
2026STL	66	0	64.0	4.08	1.28	64	29	5	9.00	3-9	38

Stats from the MLB Stats API, regular season only. A traded player's combined season appears as one row per club plus the total.