Manny Machado has left his rehab assignment with Class-A Frederick to join the Baltimore Orioles.

The Orioles are slated to host the Pittsburgh Pirates for the first of a two-game series, although there's rain in the forecast all day and night.

Machado played for Frederick over the weekend. He has been rehabbing back from offseason left knee surgery after a season-ending injury suffered in late September, and he was brought along slowly this spring before a setback while running the bases slowed his timetable.