Miss O'brien

Miss O’Brien is a 6-year-old gray/roan mare from the United States, trained by Dan Blacker, based at . She is the offspring of the stallion Mr. Big and the mare My Kinda Party. Throughout her career, Miss O’Brien has won one race. Her most notable victory occurred on May 22, 2022, at Santa Anita, where she was ridden by Drayden Van Dyke. In this race, she triumphed in the $35,733 Maiden Special Weight, beating Busker Allie.