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Waites (elbow) underwent Tommy John surgery Wednesday, Maria I. Guardado of MLB.com reports.
Waites was diagnosed with a right elbow sprain back in mid-July and apparently didn't respond very well to a period of rest and rehab. Giving the unfortunate timing of his UCL reconstruction procedure, the 25-year-old can probably be ruled out through all of next season. He's facing a 12-to-15 month recovery process.