Houck was scratched from his scheduled start Friday versus the Yankees due to right shoulder fatigue, Jen McCaffrey of The Athletic reports.
Houck was scheduled to pitch Friday on eight days of rest in order to combat what manager Alex Cora labeled a "dead arm" phase, but the 28-year-old righty looks like he will need even more time off between starts. Richard Fitts will make a spot start in Houck's stead Friday.