Brady O'Brien Stats & Bio | Mariners Second Base

About Brady O'Brien

Brady O'Brien is a second baseman for the Seattle Mariners, wearing jersey number 83. Born on June 22, 2002, in North Andover, Massachusetts, O'Brien developed his skills from the ground up before earning his opportunity at the highest level of professional baseball. He honed his craft at the University of Richmond, where he built the foundation that would eventually carry him to the majors. Standing 6'0" and weighing 195 pounds, O'Brien brings a solid, athletic frame to the middle infield. In his recent major league action, he made an immediate impression, recording a perfect 1.000 batting average with one RBI in his first game — a promising debut that signals bright things to come. At just 22 years old, Brady O'Brien's journey is only getting started.

Updated: Mar 27, 2026