A's activate Ryan Cook
Cook has a 2.30 ERA over the past two seasons and has struck out more than a batter per inning -- including 67 strikeouts over 67 1/3 innings last season -- and has filled in at closer at times, compiling 16 career saves.
The Associated Press contributed to this report.
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Jon Lester has moved to the top of the list of players who could soon get traded.