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Riley O'Brien

Pitcher · St. Louis Cardinals. 2026 season stats with ranks among qualified players.

Pitching, 2026

Riley O'Brien posted a 4.08 ERA and a 3.94 FIP with a 23.2% strikeout rate over 64.0 innings in 2026.

Stat	2026	Percentile
Innings pitched	64.0	–
Starts	0	–
ERA	4.08	27th percentile
FIP	3.94	44th percentile
xFIP	4.00	51st percentile
Strikeout %	23.2%	45th percentile
Walk %	10.5%	23rd percentile
K-BB%	12.7%	39th percentile
Home runs per 9	0.70	78th percentile
Whiff %	25.1%	54th percentile
Fastball velocity	97.7	–

Percentile compares each number with the 182 qualified pitchers in 2026 (100th = best, including for stats where lower is better).

Recent seasons

Season	IP	ERA	FIP	K%	BB%
2026	64.0	4.08	3.94	23.2%	10.5%
2025	48.0	2.06	3.61	22.5%	11.0%
2024	8.0	11.25	7.04	23.9%	17.4%

St. Louis Cardinals teammates

About these numbers

Season totals and rates from every regular-season game. wRC+ is runs created adjusted for park and league (100 is average); FIP and xFIP estimate a pitcher's run prevention from strikeouts, walks and home runs; K-BB% is strikeout rate minus walk rate.

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