Casas, who had been placed on the injury list with a strain, underwent tests in Boston that revealed the fracture. Manager Alex Cora said there is no timetable on when the 24-year-old will be back.
At this point, no one can say they didn't try the rotation, with each man getting a start in the first two and Swayman the overwhelming favorite to be in net for Game 3. But should the former Black Bear step up with another performance similar to what he had in Game 1, should the rotation meet an early end?