Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors – NBC4 Washington
Topps Now 2018 Sean Doolittle All Star Game Washington Nationals AS-31
Sean Doolittle: The all-around All-Star
Washington Nationals news & notes: Sean Doolittle announces retirement; talks 2019 World Series run + career highlights - Federal Baseball
Sean Doolittle (toe) on Nationals' disabled list, won't pitch in All-Star game
Sean Doolittle, Bryce Harper and Max Scherzer named National League All- Stars, by Nationals Communications
Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors
The Red Report 2021 - Sean Doolittle - Red Reporter
3 Nationals, 1 Oriole make MLB All-Star Game at Nats Park - WTOP News