Ex-Nats reliever Sean Doolittle exits after '11 incredible seasons' - ESPN
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Washingtonblade.com, Volume 49, Issue 28, July 13, 2017 by Washington Blade - Issuu
Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors
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Washington Nationals re-sign Sean Doolittle to minor league deal; decline 2023 option for Nelson Cruz - Federal Baseball
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Washington Nationals' Sean Doolittle on MLB's 2020 season; decreased velo + more - Federal Baseball
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2019 Washington Nationals season - Wikipedia
Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors
