Sean Doolittle spent his entire 11-season career as a relief pitcher. He started with the Oakland Athletics in 2012 and became an All-Star in 2014 when he saved 22 games. Doolittle was traded to the Washington Nationals in 2017 and continued to save at least 20 games annually until 2019.
In 2018, Doolittle made his second All-Star appearance and in the following year, he led the National League in games finished (55) and helped the Washington Nationals win their first World Series. He finished his career with stints in Cincinnati, Seattle, and a second run with Washington, saving a total of 112 games throughout his career.