Marlins fire John Mallee, name ESPN analyst Eduardo Perez as new hitting coach

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The Marlins must have been inspired by the quick hook that the Rangers gave to rookie hitting coach Thad Bosley on Wednesday afternoon.

According to the Marlins’ official Twitter feed, hitting coach John Mallee has been “relieved” of his duties and ESPN baseball analyst Eduardo Perez will take over the gig Thursday.

Mallee was promoted to the role of major league hitting coach in June of last season after spending nine years as a minor league hitting instructor in the Marlins’ farm system. He was drafted as a player by the Phillies in 1991 and hit .208 in 115 career minor league games before hanging up his cleats in ’92.

The Marlins ranked 19th in runs scored, 21st in total hits, 17th in home runs and 15th in team OPS heading into Wednesday’s action and lost to the Braves in extra innings tonight. Rarely would any of that be the hitting coach’s fault, but the front office decided to name a scapegoat and Mallee got the boot just an hour or two after Florida’s defeat. The appeal of adding a “big name” like Perez also probably played a part.

Perez has no major league or minor league coaching experience, but he serves as skipper for Leones De Ponce of the Puerto Rico Baseball League in the winter and won Manager of the Year there in 2008.

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.