Tuivailala is expected to require season-ending surgery on his Achilles, Ryan Divish of The Seattle Times reports.

Tuivailala hit the 10-day disabled list with a strained right Achilles on Thursday and the injury appears to be a significant one. He appeared just five times for Seattle after being acquired from St. Louis in late July. Assuming his season is indeed over, the 25-year-old will end the year with a 3.41 ERA in 37 innings of relief.

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