Luis Perez done for season with torn UCL in elbow

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Another day, another injury for the Blue Jays’ pitching staff.

According to Shi Davidi of Sportsnet.ca, Luis Perez is done for the season with a torn ulnar collateral ligament in his left elbow. The Blue Jays have yet to make an announcement on a course of action, but Tommy John surgery is almost certainly on the table. If he undergoes the surgery, he will be out through the All-Star break next year.

Perez is the third member of the Jays’ staff to go down with a ulnar collateral ligament injury this season, joining Kyle Drabek and Drew Hutchison. Drabek underwent Tommy John surgery while Hutchison is currently rehabbing a sprained UCL.

Perez has been a valuable member of Toronto’s bullpen this season, posting a 3.43 ERA and 39/16 K/BB ratio in 42 innings. The 27-year-old southpaw was knocked around for two runs on four hits in his most recent appearance yesterday against the White Sox.

Dodgers designate Sergio Romo for assignment

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The Dodgers announced on Thursday that the club activated pitcher Grant Dayton from the 10-day disabled list and designated pitcher Sergio Romo for assignment.

Dayton, 29, went on the disabled list earlier this month with neck stiffness. He’ll resume with a 3.63 ERA and a 20/12 K/BB ratio in 22 1/3 innings.

Romo, 34, signed a one-year, $3 million deal with the Dodgers in February. It didn’t really work out, as the right-hander posted a 6.12 ERA with a 31/12 K/BB ratio in 25 innings. His peripherals are still decent, so it wouldn’t be surprising if a team in need of a bullpen arm makes a deal with the Dodgers within the week.

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.