Riley O'Brien Stats & Bio | Cardinals Pitcher

About Riley O'Brien

Riley O'Brien is a pitcher for the St. Louis Cardinals, wearing jersey number 61. Standing at 6'4" and weighing 180 lbs, the Seattle, Washington native brings a tall, athletic frame to the mound that commands attention in any ballpark. Born on February 6, 1995, O'Brien developed his game at the College of Idaho, where he honed the mechanics and competitive instincts necessary to reach professional baseball's highest level. As a pitcher, O'Brien understands that consistency and resilience are the hallmarks of longevity in the major leagues. While his recent stretch of 1.2 innings across two games reflects an ongoing process of finding his rhythm at the MLB level, O'Brien's journey from the Pacific Northwest to a storied franchise like the Cardinals speaks to his determination and dedication to the craft.

Updated: Mar 11, 2026