Castillo was impressive in a live batting practice at Monday's summer camp workouts, Juan Toribio of MLB.com reports.

EDGE Analysis

The 26-year-old had already been working out at Tropicana Field prior to the start of summer camp, so his effective performance Monday wasn't necessarily surprising. Castillo faced Willy Adames and Kevin Kiermaier in the session, and manager Kevin Cash noted the right-hander looked "really, really crisp" while also remarking Adames was left wide-eyed in admiration at the reliever's stuff.