Jenrry Mejia to undergo Tommy John surgery

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In a veritable double-whammy, the Mets also announced this evening that prospect right-hander Jenrry Mejia will undergo Tommy John surgery.

According to Andy Martino of the New York Daily News, the decision was made after Mejia met with Dr. James Andrews earlier today.

Team doctor David Altchek recommended surgery last week after Mejia was diagnosed with a complete tear of the MCL in his right elbow.

Mejia, 21, posted a 2.86 ERA and 21/14 K/BB ratio over his first four starts with Triple-A Buffalo this season. Tommy John surgery isn’t exactly a death sentence, but his development will now be halted until somewhere around the midpoint of the 2012 season.

Report: Diamondbacks sign Jarrod Dyson to two-year, $7.5 million contract

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ESPN’s Jerry Crasnick reports that the Diamondbacks have signed outfielder Jarrod Dyson to a two-year contract. Jon Heyman of FanRag Sports reports that the deal is worth $7.5 million.

Dyson, 33, spent last season with the Mariners. He hit an underwhelming .251/.324/.350, but stole 28 bases while playing superb defense in center field.

Dyson doesn’t quite make up for the Diamondbacks losing J.D. Martinez, who just signed with the Red Sox, but he will bring some speed and defense to the outfield along with A.J. Pollock. It’s not quite clear how the D-Backs plan to utilize Dyson. That should be made clear after the deal is announced.