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Sunday’s shaky relief appearance might have been Justin Masterson’s last in a Boston Red Sox uniform.
The Red Sox designated the right-hander for assignment after he gave up a solo home run in one-plus inning of work in a 7-2 win over the Detroit Tigers. The earned run raised Masterson’s ERA this season to 5.61 — the worst among all Red Sox relievers.
“It was consistent strike-throwing, when you boil it down to it,” manager John …