A's exercise Grant Balfour contract option, decline Stephen Drew
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Oakland Athletics: Three options at closer in 2020-21
A's closer Sean Doolittle has the best strikeout-to-walk ratio in baseball history and it's not even close - NBC Sports
Oakland Athletics Top 28 Prospects | FanGraphs Baseball
Adam Oller: Breaking News, Rumors & Highlights | Yardbarker
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Lou Trivino not giving up Oakland A's closer job
Isringhausen, Balfour, Street, Hendriks: The A's rich history of losing their star closers – Daily Democrat
Good night, Mr. Young': A's closer Blake Treinen on Cy-worthy run - ABC7 San Francisco
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Forgotten Greats: Seven Oakland A's starting pitchers we should remember more often - Athletics Nation
3 potential destinations for Oakland A's closer Lou Trivino
Oakland Athletics closer Blake Treinen wins arbitration case, to make $6.4M - ESPN
The Oakland A's Are Crashing the Playoff Race Again - The New York Times
A's closer Blake Treinen looking to add to repertoire