Boston Red Sox starting pitcher Drew Pomeranz was forced to leave Friday night's game against the New York Yankees in the fourth inning due to back spasms, per Pete Abraham of the Boston Globe.
Pomeranz appeared to tweak something, and manager John Farrell decided to remove him from the game after he attempted two warm-up pitches.
Prior to leaving, Pomeranz had allowed four hits and no runs while striking out four in 3.1 innings with Boston leading 2-0.
Pomeranz was replaced in the game by long reliever Brandon Workman.