RO
Baseball · MLB · P
← All playersRiley O'Brien
St. Louis Cardinals · 50 pitching games · bats R · throws R
Compare opens a player picker · 2026 regular season · latest
ERA3.0817 ER
WHIP1.1135 H · 20 BB
Strikeouts49208 faced
Innings49.250 G · 0 GS
Record3–430 SV · 1 HLD
Pitches813496 strikes
How the batters faced ended
73.6%retired · 153 of 208
| Outcome | Count | Share | Detail | |
|---|---|---|---|---|
| Retired153 · 73.6% | ||||
| Other outs | 104 | 50.0% | ||
| Strikeouts | 49 | 23.6% | ||
| Reached55 · 26.4% | ||||
| Hits allowed | 35 | 16.8% | ||
| Walks | 20 | 9.6% | ||
Every row is a share of the same 208 batters faced, so the lengths are directly comparable. Other outs are derived — batters faced less hits, walks and strikeouts — and a batter who reached on an error is counted among them. The mark on each row is what a regular does — 256 pitchers with at least 200 batters faced this season, pooled.
Rate trend
ERA and WHIP share one scale but measure different things — compare each line with itself across seasons; the vertical gap between the two is not a performance margin.
Season volume
Raw season totals, not per-game rates. Playing time and season length affect every bar, so a shorter bar does not necessarily mean worse rate performance.