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Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors - NBC Sports
Nationals pitcher and LGBTQ ally Sean Doolittle retires from MLB - Outsports
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Washington_Nationals
Washington Nationals' closer Sean Doolittle almost got a shot at an All-Star moment in Washington, D.C. - Federal Baseball
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Sean Doolittle retires after path led to All-Star, World Series honors
Ex-Nats reliever Sean Doolittle exits after '11 incredible seasons' - ESPN
Sean Doolittle Returning To Washington Nationals
Nats still hoping quality lefty emerges for bullpen - Blog