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The Seattle Mariners have shut down pitcher Hisashi Iwakuma for an additional 10 to 14-day stretch after he suffered a setback during a throwing session last week, reported. 

By SI Wire
May 12, 2015

The Seattle Mariners have shut down pitcher Hisashi Iwakuma for an additional 10–14 days after he suffered a setback during his rehabilitation last week, reported

Iwakuma reported that he felt additional soreness in his back after a throwing session on Friday, according to the report, which led to the move.

The Mariners placed Iwakuma on the disabled list on April 24 with a strained right latissmus dorsi​. He has not pitched since then. 

Mariners manager Lloyd McClendon previously expressed optimism that Iwakuma would bounce back from two mediocre starts at the beginning of the season.

But he told Friday that Iwakuma is not progressing in his rehab as well as he had hoped he would.

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During his last start on April 20, Iwakuma felt shoulder fatigue, general manager Jeff Zduriencik said. 

Iwakuma struggled in his first three starts of the 2015 season, going 0–1 and posting a 6.61 ERA.​

The 34 year old pitcher is in the final year of a three-year, $20 million contract with the Mariners. 

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