Sean Doolittle, Baseball's Left-Wing Lefty, Retires

Rehabbing Sean Doolittle won't be on Nationals' Opening Day roster - The Washington Post

Whether on the mound or for refugees in need, relief is a calling for the A's' Sean Doolittle - Los Angeles Times

Former Oakland A's, Washington Nationals reliever announces retirement

Sean Doolittle, Baseball's Left-Wing Lefty, Retires

Jose Castillo on comeback trail again for Padres - The San Diego Union-Tribune

FredNats notebook: In rehab stint, Doolittle pitches in to mentor young FredNats pitchers

Sean Doolittle retires

Sean Doolittle returns to Nationals Park as a Cincinnati Red - The Washington Post

Sean Doolittle retires

Brad Hand - Wikipedia