Oakland A's trade Sean Doolittle & Ryan Madson to Nationals for

Mets: Why a trade for reliever Blake Treinen is worth exploring

A's trade Sean Doolittle to Nationals in 5-player deal

Is Blake Treinen the best closer in baseball? - Diamond Digest

2018 Oakland Athletics Season Preview - Last Word On Baseball

Report: Nationals eyeing Doolittle, Madson

Nationals acquire Doolittle, Madson from A's

Billy Beane explains A's trade of Sean Doolittle and Ryan Madson

Four A's and Giants prospects selected to the MLB All-Star Futures Game — when might they be big leaguers? - The Athletic

2017 Oakland Athletics Midseason Top 10 Prospects — College Baseball, MLB Draft, Prospects - Baseball America

A's trade popular pitcher in five-player deal with Nationals – East Bay Times

Sean Doolittle Announces Retirement - MLB Trade Rumors

Washington Nationals acquire Sean Doolittle and Ryan Madson from Oakland Athletics for Blake Treinen + prospects - Federal Baseball