An hour after fortifying their starting rotation with the acquisition of RHP Ryan Dempster, the club confirmed a worst-case scenario with RHP Neftali Feliz. He has a tear in his ulnar collateral ligament and will require Tommy John ligament transplant surgery. Feliz, 24, was diagnosed with a sprained ligament in his elbow in May and then placed on the DL. He passed all tests and began a rehab assignment with Double-A Frisco in mid-July. After three starts, however, he complained of more elbow soreness and was scratched from an outing with Triple-A Round Rock.
Neftali Feliz to have Tommy John Surgery; 2013 in question
Dallas Morning News | Aug 1