BOSTON (CBS) – As expected, Josh Beckett will miss his scheduled start Sunday against the Minnesota Twins.

In his place, left Franklin Morales will make his sixth start of the season for Boston.

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Morales is 2-1 with a 3.42 ERA while striking out 31 over 26.1 innings in five starts for the Red Sox this season. Overall, he is 2-2 with a 3.32 ERA in 33 appearances.

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Beckett was pulled in the third inning Tuesday night against the Tigers after suffering back spasms on a wet Fenway mound, and has not thrown since.

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Manager Bobby Valentine said Beckett was feeling better, and a trip to the disabled list is “unlikely.”