Chien-Ming Wang could be sidelined for another month

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Nationals manger Davey Johnson did not hold back Wednesday when describing the severity of starter Chien-Ming Wang’s strained left hamstring (via CSNWashington.com’s Nats Insider):

“He’s moving around walking good, but from what I saw today, he’s got quite a bit of blood in there,” Johnson said. “Before he gets on the mound, I’d say three weeks, maybe a month. I’ll have to double-check with the doctor, but I just saw a lot of blood in there.”

Wang is going to play catch on Thursday, but Johnson is suggesting in the quote above that the Taiwanese right-hander won’t be allowed to get back on a mound before the Nats head north for the start of the regular season. Which means Wang is certain to miss his first couple turns in the rotation, and possibly all of April.

John Lannan, who has been on the trading block for most of this spring, appears likely to open the regular season as Washington’s No. 5 starter. He had a 3.70 ERA and 1.46 WHIP in 184 2/3 innings last 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.