Sean Doolittle is a professional baseball pitcher who currently plays for the Washington Nationals. He was drafted by the Oakland Athletics in 2007 and made his major league debut in 2012. He was traded to the Nationals in 2017 and has since become one of the most reliable closers in the National League. Doolittle is known for his strong fastball and his ability to strike out batters. He has been an All-Star twice and won the Trevor Hoffman Award in 2018.