The Texas Rangers placed starter Max Scherzer on the 15-day injured list due to right shoulder fatigue, according to the Associated Press (h/t ESPN).
The move was retroactive to Wednesday, while the team called up lefty Walter Pennington from Texas' Triple-A affiliate.
Scherzer experienced issues during a start against the St. Louis Cardinals, exiting after just four innings and 68 pitches. After the game, he explained that he was "trying to grind through these starts and ramp up."
The three-time Cy Young Award winner didn't make his season debut until June 23 after he underwent back surgery in Dec.