Harvey underwent successful Tommy John surgery Tuesday, Roch Kubatko of MASNsports.com reports.
Harvey exited a start back on July 16 reporting elbow soreness and ended up visiting Dr. James Andrews shortly after to diagnose the problem. It was determined that the right-hander would need ligament replacement surgery, which he had Tuesday. At only 21 years old, Harvey likely has a long career ahead of him, but in the short term he'll probably miss all of 2016 and most of 2017 as he goes through Tommy John rehab.