A's prospect Michael Ynoa to undergo Tommy John surgery

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Michael Ynoa almost immediately had arm problems after the A’s signed him out of the Dominican Republic as a 16-year-old for an international record $4.25 million in 2008 and today the team announced that he’ll undergo Tommy John elbow surgery.
Ynoa has appeared in just three pro games, all this season, tossing nine innings with a 5.00 ERA and 11/4 K/BB ratio at rookie-ball. His fastball was clocked in the mid-90s before he was shut down, but now he’ll miss most and perhaps all of next season.
Of course, he’s so young that even missing all of next season would leave Ynoa coming back in 2012 as a 20-year-old. Interestingly, as Ben Badler of Baseball America notes the A’s will need to protect Ynoa from the Rule 5 draft by placing him on the 40-man roster after the 2012 season, at which point he’ll likely still be at Single-A.