Decreased velocity leads to DL stint for Rafael Perez

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Rafael Perez showed significantly diminished velocity in his last outing, with his fastball topping out in the mid-80s, and not surprisingly it turns out he was injured.

Cleveland has placed Perez on the disabled list with a strained lat muscle in his shoulder, recalling Nick Hagadone from Triple-A to replace him on the roster.

Perez has been a key setup man for the Indians during the past five seasons, posting an ERA under 3.50 in four of those years, but the 30-year-old left-hander’s average fastball velocity has gone from 90.7 miles per hour in 2010 to 89.3 mph in 2011 to 87.7 mph this year.

Rubby De La Rosa to undergo a second Tommy John Surgery

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This is unfortunate: Diamondbacks reliever Rubby De La Rosa will undergo Tommy John surgery. This will be the second Tommy John procedure of his career, the first coming back in 2011.

De La Rosa has had elbow  issues for his entire career. Last year his UCL was barking again and he underwent stem cell therapy to try to avoid a second surgery, but it obviously hasn’t worked out. He’s pitched in only nine games this year, allowing four earned runs in seven and two-thirds innings, striking out 12.

I first saw De La Rosa in spring training in 2011. I thought his stuff was pretty phenomenal and figured he’d be a good one. Great stuff is often a function of heavy strain on an elbow, however, and pitchers breaking is, unfortunately, the rule in baseball far more than the exception.

He’ll miss a year at least. We likely won’t see him until spring of 2019, most likely on a minor league deal.

Cardinals closer Trevor Rosenthal to be examined for arm tightness

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Cardinal closer Trevor Rosenthal was taken out of last night’s game against the Red Sox after he gave up a big homer and a walk. He velocity was down as well, and Mike Mathney said after the game that he didn’t look right. Now the Cardinals are going to take a closer look at him, and he’ll be examined today for what is being described as “tightness” in his right arm.

Rosenthal is 3-4 with a 3.40 ERA and a K/BB ratio of 76/20 in 47.2 innings. He has 11 saves after regaining the closer’s job from Seung Hwan Oh. Now some combination of Oh, Tyler Lyons, and John Brebbia will fill in for Rosenthal to the extent he needs to miss time.