Riley O'Brien

About Riley O'Brien

Riley Chun-Young O'Brien (born February 6, 1995) is an American professional baseball pitcher for the St. Louis Cardinals of Major League Baseball (MLB). He has previously played in MLB for the Cincinnati Reds and Seattle Mariners. O'Brien played college baseball and Everett Community College and the College of Idaho. He was selected by the Tampa Bay Rays in the eight round of the 2017 Major League Baseball draft and made his MLB debut in 2021 with the Reds. With St. Louis, O'Brien was named to his first All-Star game in 2026 and was tied with Mason Miller for the NL lead in saves that same year with 38.

Bio summary from Wikipedia.