Gray left Tuesday's game with tightness in his abdomen and will undergo an MRI, Patrick Saunders of the Denver Post reports.
The right-hander fielded a comebacker and tried to start a double play in the first inning, but his throw to second base sailed into center, and it seems he may have strained some abdominal muscles in the process. While the severity of the injury will not be known until the MRI results come back, this seems like the type of injury that could threaten Gray's availability for the start of the season.