Rizzo is experiencing lower back tightness and has been scratched from the Cubs' Cactus League lineup Thursday, Patrick Mooney of CSN Chicago reports.
It appears to be a safety measure, but Chris Dominguez will replace him at first base. Rizzo's status is worth watching, but unless the injury worsens in the coming days or weeks, the 27-year-old should remain a steady first-round mixed fantasy pick.