Bronson Arroyo to undergo Tommy John surgery

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Diamondbacks right-hander Bronson Arroyo recently resumed throwing after he was diagnosed with a sprained ulnar collateral ligament in his right elbow last month, but he told Steve Gilbert of MLB.com late this afternoon that he will undergo season-ending Tommy John surgery.

With pitchers going down left and right this year, we really shouldn’t be surprised by another pitcher headed for Tommy John surgery at this point, but it’s still striking given Arroyo’s well-documented durability. The 37-year-old averaged 211 innings per season from 2005-2013 and threw at least 199 innings in all of them. He posted a 4.08 ERA in 14 starts with the Diamondbacks prior to landing on the DL for the first time in his career last month. It turns out he made six of them with a torn UCL.

Tommy John surgery typically carries a timetable of around 12 months, so Arroyo figures to be sidelined through midseason next year. He’s owed $9.5 million in 2015 while his contract includes an $11 million club option for 2016 or a $4.5 million buyout.

Braves claim Grant Dayton off waivers from Dodgers

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The Braves claimed lefty reliever Grant Dayton off waivers from the Dodgers, Bill Shaikin of the Los Angeles Times reports.

Dayton, 29, underwent Tommy John surgery back in August and is almost certainly out for the entire 2018 season. The Braves, obviously, are making a longer-term play here by acquiring him, as he is under team control through 2022.

Over parts of two seasons in the majors, Dayton has a 3.42 career ERA with 59 strikeouts and 18 walks in 50 innings.