Nate Karns underwent season-ending surgery for thoracic outlet syndrome

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MLB.com’s Jeffrey Flanagan reports that Royals pitcher Nate Karns underwent surgery for thoracic outlet syndrome on Wednesday. He’s expected to be ready for spring training next year. Karns went on the disabled list in May with an elbow injury and didn’t make much progress.

The Royals acquired Karns from the Mariners in January in exchange for outfielder Jarrod Dyson. Over eight starts and one relief appearance, the 29-year-old right-hander compiled a 4.17 ERA and a 51/13 K/BB ratio in 45 1/3 innings.

Karns will enter his first of three years of arbitration eligibility after the season, so he’ll be under the Royals’ control through 2020.