New York Yankees left-hander James Paxton has had back surgery and is expected to be sidelined until May or June.
New York said Dr. Andrew Dossett performed a microscopic lumbar discectomy, in which a herniated disk is repaired, and removed a peridiscal cyst.
The Yankees estimated Paxton's approximate timeline to pitch in a major league game is three-to-four months.
Paxton left his final regular-season start, at Texas in Sept. 27, after one inning with what the Yankees said was a tight left glute muscle.
That ended Paxton's career-best streak of victories in 10 consecutive starts.