Sean Doolittle, Ryan Madson traded to Nationals from A's - Sports
Oakland Athletics 2018 Trade Season Primer - Athletics Nation
Sean Doolittle, known for his liberal views, won't be at the White
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Washington_Nationals
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Sean Doolittle, Nationals agree to one-year-deal - The Washington Post
2019 NLDS: Sean Doolittle Insists Nationals 'Weirdly Comfortable