Ramirez's contract was purchased from Triple-A Pawtucket on Tuesday, Chris Cotillo of MassLive.com reports.

Ramirez has a mediocre 4.36 ERA in seven big-league seasons. He was particularly poor last year, getting knocked around for a 6.50 ERA in 10 starts with the Mariners. He'll fill a bullpen role in Boston, taking the spot vacated by Marcus Walden after Walden was optioned Monday.

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