The first four spots in the Cubs rotation are pretty well locked down.
Kyle Hendricks will start on Opening Day (although that has not yet been officially announced). Marcus Stroman will follow, and then likely Wade Miley after that, though Miley has yet to throw in a spring game. The fourth spot is almost certainly going to Alec Mills.
Two lefthanders will vie for the No. 5 spot. Only one of them has thrown in a game so far. That’s Justin Steele, who had a good two-inning outing against the Padres Saturday and who will take the mound today in Tempe against the Angels.