Detroit optioned right-hander Kevin Whelan to Triple-A Toledo, and Erie catcher Ramon Cabrera was claimed off waivers by the Pirates.
Farmer was called up to make his major league debut after injuries to Anibal Sanchez and Justin Verlander - and Sunday's 19-inning game that required a relief appearance by Rick Porcello - left Detroit's starting rotation in a bit of a mess. Farmer has spent most of this season at Class A West Michigan before making two starts for Erie.
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