Riley O'Brien

Nationality: United States
Born: 1995-02-06
Birthplace: Seattle, Washington
Height: 6' 4"
Weight: 180 lbs
Position: Pitcher

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. He made his MLB debut in 2021.