Osage City's Treinen traded from Nationals to A's for Madson, Doolittle

Washington Nationals relief pitcher Blake Treinen (45) celebrates with catcher Wilson Ramos, right, following a baseball game against the Kansas City Royals at Kauffman Stadium in Kansas City, Mo., Wednesday, May 4, 2016. The Nationals defeated the Royals 13-2. (AP Photo/Orlin Wagner)
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CINCINNATI (AP) -- Looking to fortify a bullpen that has blown more than a third of its save chances, the Washington Nationals acquired relievers Ryan Madson and Sean Doolittle from the Oakland Athletics for right-hander Blake Treinen and a pair of prospects.

Left-hander Jesus Luzardo and infielder Sheldon Neuse were sent to Oakland as part of Sunday's deal.

A 36-year-old right-hander, Madson has a 2.06 ERA and is seventh among relievers in hits plus walks per inning at 0.79. He has not allowed any of the seven inherited runners to score in his past 13 appearances.

Doolittle is a 30-year-old left-hander who has held left-handed batters hitless in 23 at-bats this year with 12 strikeouts and no walks. He is 1-0 with three saves, a 3.38 ERA and 31 strikeouts in 21 1/3 innings.

NL East-leading Washington has a strong rotation led by Max Scherzer (11-5), Stephen Strasburg (9-3) and Gio Gonzalez (8-4) but has converted just 22 of 36 save chances.