Nationals to promote Nate Karns to start Tuesday

May 27, 2013, 3:31 pm
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The Nationals will call up prospect right-hander Nate Karns to start Tuesday against the Orioles, reports Mark Zuckerman of He’ll fill the rotation spot of Ross Detwiler, who has been dealing with a right oblique strain for well over a week and was finally placed on the disabled list yesterday. Karns only has nine…