Riley O'Brien

Bats R Throws R6'4" 180 lbBorn 1995 Seattle, USADebut 2021Team STL1x All-StarDraft 2017 R8 #229 Tampa Bay Rays, College of IdahoContract 1 y/$795,050 (26) 2026: $795,050

Projections

Season	BF	K%	BB%	HR%	1B%	XBH%	PITCH+
2026	178	23.6	9.9	2.57	21.0	6.17	105.5
2027							104.8
2028							104.2

Projected rates are per plate appearance or batter faced; counting stats scale with projected playing time. Statcast measurements inform these projections as inputs and are reported as measurements, not projected.

Most similar through age 30

His ten closest age-30 comparables averaged 97 PITCH+ the next season; 10 of 10 played. Averages cover only the players who got a next season, which is why the played count matters.

#	Player	Through	PITCH+ then	Next season	Next PA / BF
1	Brian Sanches	2009	93.5	114.4	254
2	Jeff Brigham	2022	93.7	99.5	160
3	Sam Moll	2022	97.3	111.9	268
4	Ryan Burr	2024	98.7	136.6	8
5	Chris Hatcher	2015	95.8	89.2	181
6	James Hoyt	2017	100.6	33.6	3
7	Oliver Drake	2017	99.9	95.7	209
8	Danny Young	2024	99.6	106.2	37
9	Spencer Bivens	2024	99.2	97.7	343
10	Luke Farrell	2021	93.6	82.7	70

Pitching

Year	Team	W	L	ERA	G	GS	SV	IP	BF	HR	BB	SO	PITCH+
2027 proj									178				104.8
2026*									214				118.1	101.9	120.1
2025	STL	3	1	2.06	42	0	6	48.0	199	2	22	45	111.4	102.1	113.5
2024	STL	0	0	11.25	8	0	0	8.0	46	2	8	11	47.8	94.6	42.4
2022	SEA	0	0	0.00	1	0	0	1.0	5	0	1	1	92.7	96.9	89.6
2021	CIN	0	1	13.50	1	1	0	1.3	9	2	3	2	-11.5	100.0	-11.5
Career		3	2	3.55	52	1	6	58.3	259	6	34	59	95.5		96.1

Fielding

Year	Team	Pos	G	Inn	PO	A	DP	Fld%	Runs saved
2025	STL	P	42	48	5	8	1	1.000	+0.5
2024	STL	P	8	8	0	0	0		-0.3
2022	SEA	P	1	1	0	0	0		-0.0
2021	CIN	P	1	1	0	0	0

Runs saved covers the Statcast era; for catchers it includes framing.

Minor leagues

Year	Level	Team	Side	PA / BF	Line	AVG / ERA	OPS
2021	AAA	Louisville Bats	Bat	28	0 HR, 0 SB	0.167	0.467
2025	AAA	Memphis Redbirds	Pit	86	19.1 IP, 37% K	2.83
2024	AAA	Memphis Redbirds	Pit	52	13.1 IP, 17% K	1.37
2023	AAA	Tacoma Rainiers	Pit	228	55.0 IP, 38% K	2.29
2022	AAA	Tacoma Rainiers	Pit	184	36.2 IP, 23% K	7.21
2022	AAA	nan	Pit	196	39.2 IP, 24% K	7.12
2021	AAA	Louisville Bats	Pit	490	112.2 IP, 25% K	4.57
2019	AA	Montgomery Biscuits	Pit	297	68.2 IP, 24% K	3.96
2019	A+	Charlotte Stone Crabs	Pit	132	34.0 IP, 27% K	1.59
2018	A+	Charlotte Stone Crabs	Pit	172	40.0 IP, 22% K	3.60
2018	A	Bowling Green Hot Rods	Pit	185	48.1 IP, 36% K	2.06
2017	Rk	Princeton Rays	Pit	159	41.0 IP, 25% K	2.20

Splits

Year	vs LHP	vs RHP	Home	Away
2026	0.287	0.260	0.266	0.283
2025	0.235	0.295	0.226	0.319
2024	0.552	0.406	0.304	0.542
2022	0.000	0.800	0.320
2021	0.820	0.500		0.678

wOBA by split, from pitch level data, 2015 on. For pitchers the split is the batter side faced.