Mullins is not in the Orioles' lineup for Saturday's game against the Diamondbacks, Jacob Calvin Meyer of The Baltimore Sun reports.
Mullins has struggled over his last three outings, going 1-for-12 with five strikeouts over that span. Orioles manager Brandon Hyde said Mullins is "pressing big-time," per Roch Kubatko of MASNSports.com, though Mullins is still available off the bench for Saturday's contest. Heston Kjerstad will start at left field while Colton Cowser shifts to center field.