TORONTO — Star rookie Kristian Campbell has been scratched from the Red Sox lineup Thursday against the Blue Jays because of right rib discomfort. The 22-year-old was supposed to play center field and bat seventh. Jarren Duran has been moved from left field to center field. Rob Refsnyder, who was not in the initial lineup, will play left field.

The Boston Red Sox issued a harsh update on their rookie phenom just before their rubber match against a division rival.

Rookies are supposed to arrive in the big leagues and go through a significant transition. Sometimes teams can give them time to work through their struggles, but even top prospects get demoted. Most are expected to struggle. That was true for the Red Sox when they made Kristian Campbell an everyday player on their Opening Day roster.