Riley O'Brien is a right-handed pitcher for the St. Louis Cardinals.

In MLB, Riley O'Brien has appeared in 88 games (94.2 IP) with a 3.61 ERA, a 1.32 WHIP, and 8.94 strikeouts per nine innings, on 94 strikeouts and 46 walks. In AAA, Riley O'Brien has appeared in 140 games (240.0 IP) with a 4.13 ERA, a 1.36 WHIP, and 11.06 strikeouts per nine innings, on 295 strikeouts and 129 walks.

Riley O'Brien's most recent tracked outing on netpitch was Aug 18, 2026 (MLB 2026).

Use the interactive dashboard above to break down Riley O'Brien's pitch mix, velocity, command, sequencing, count leverage, and damage-risk trends across every tracked MLB and AAA appearance.