Orioles manager Buck Showalter said Thursday that Chris Tillman (abdomen) will start the fifth game of the season. There's still a chance that Tillman will start the season on the disabled list, but because the Orioles have kept him on the minor league side, they would have the ability to backdate it and bring him back for the fifth game of the season. Showalter hasn't announced the final member of the starting rotation, but Jake Arrieta is the favorite.