A.J. Griffin to undergo Tommy John surgery Wednesday

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Athletics assistant general manager David Forst refuted a report last week that right-handed starter A.J. Griffin was headed for season-ending Tommy John surgery. But there’s no more refuting it now.

CBS Sports’ Jon Heyman confirmed Tuesday that Griffin will indeed undergo the reconstructive elbow procedure, and Susan Slusser of the San Francisco Chronicle says it’ll happen Wednesday in Houston.

Griffin was shut down in the middle of spring camp with right elbow discomfort and later got diagnosed with a flexor muscle strain. He will now be sidelined through at least the first month of the 2015 season.

Griffin, 26, owns a 3.60 ERA and 1.126 WHIP in 282 1/3 career major league innings.

The A’s also lost Jarrod Parker to Tommy John surgery earlier this 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.