Ex-Nats reliever Sean Doolittle exits after '11 incredible seasons' - ESPN
Nationals Overcome Astros in Game 6 to Extend World Series - The
Sean Doolittle - Wikipedia
Sean Doolittle retires after 11 MLB seasons with a 'full heart
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After 11 seasons in the MLB, NATS pitcher, Sean Doolittle
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Sean Doolittle Announces Retirement After 11 Seasons in MLB
Sean Doolittle - Wikipedia