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SIerra was outrighted off the 40-man roster Sunday, MLB.com reports.

Sierra has struggled to the tune of a 7.16 ERA and .305 opponent batting average at High-A Rancho Cucamonga this year, but it's still a bit surprising to see the highly-touted foreign prospect suddenly outrighted. Given his six-year, $30 million contract, Sierra will likely stay within the organization.

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