He is not expected to pitch again until the 2021 season.JAMO UPDATE: Yesterday, Jameson Taillon underwent flexor tendon repair surgery and during the procedure it was determined that Jameson also required right elbow UCL revision surgery (Tommy John surgery).— Pirates (@Pirates) August 14, 2019This will be the second time since being drafted by the Pirates that Taillon has had Tommy John surgery. He also underwent the procedure in 2014. Jameson Taillon can’t catch a break.While undergoing flexor tendon repair surgery on his pitching elbow, it was discovered he also had damage to his ulnar collateral ligament, so he also underwent Tommy John surgery, the team announced. Taillon’s career has been marred with injury and sickness as he also was diagnosed with testicular cancer in 2017.Taillon, 27, was the No. 2 pick in the 2010 MLB Draft behind only Bryce Harper. He was then a top prospect and has been very good in his time with Pittsburgh posting a 29-24 record with a 3.67 ERA in 466 innings pitched.But due to his injuries he has played just one full season (2018) and has pitched no more than 133 2/3 innings in any other season (2017).