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The Red Sox selected Rivera's contract from Triple-A Worcester on Wednesday.

Rivera compiled a 0.90 ERA and 0.90 WHIP in 10 frames over his two starts with Double-A Portland to begin the season before receiving a promotion to Worcester earlier in the week, but he'll temporarily bypass the Triple-A assignment to provide a fresh arm in the big-league bullpen who's capable of covering multiple innings. The Red Sox optioned righty Jack Anderson to Triple-A to clear a spot on the 26-man active roster for Rivera.

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