What happened: The Chicago White Sox are calling up outfield prospect Braden Montgomery, the headline return from the trade that sent Garrett Crochet to Boston, according to a source cited by MLB.com. The move would bring one of the organization's most-watched young bats to the major-league roster.

Why it matters: Montgomery was the centerpiece of the Crochet deal, so his arrival is a marker of where the White Sox rebuild stands. Promoting the trade's top prospect signals the front office believes its long-term core is ready to begin contributing at the big-league level.

What to watch: Watch for a corresponding roster move and confirmation of Montgomery's debut date, lineup spot, and defensive assignment once the call-up is official.