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Ex-Nats reliever Sean Doolittle exits after '11 incredible seasons' - ESPN
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Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors – Metro US
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Sean Doolittle Announces Retirement - MLB Trade Rumors
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Sean Doolittle Announces Retirement - MLB Trade Rumors
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Nationals Doolittle Retires Baseball, National Sports
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Nationals pitcher Sean Doolittle announces his retirement after more than a decade in the majors - WTOP News
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All-Star reliever Sean Doolittle retires after 11 seasons - Field Level Media - Professional sports content solutions
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Nationals' Sean Doolittle retiring after more than a decade in the majors
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Off the wire