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Red Sox designate Justin Masterson for assignment

The 30-year old was placed on revocable waivers last week but was claimed.

Rick Osentoski-USA TODAY Sports

Justin Masterson was place on revocable waivers last week and after he was not claimed the Red Sox have opted to move on. Masterson has struggled at times throughout 2015, and according to Brian MacPherson of The Providence Journal, Boston has designated Masterson for assignment.

Boston signed Masterson to a one-year, $9.5 million deal in December after posting a 5.88 ERA over 128.2 innings last season. He has also been plagued by shoulder, knee, and back injuries but between 2011 and 2013 proved to be one of the most effective arms in baseball. Over those three years, he averaged 205 innings a season.

Masterson told reporters he was open to a trade in June, however his inflated ERA has likely made it difficult for the Red Sox to move him. Over 58.1 innings this season, Masterson has posted a 5.55 ERA and 4.61 FIP. He has only made nine starts but has not had much more success pitching out of the bullpen.

Masterson, 30, has pitched to a career 4.31 ERA and 3.92 FIP.

The Red Sox have yet to announce the corresponding move.