Mayo is not in the lineup for Monday's game against the White Sox, Roch Kubatko of MASNSports.com reports.
Mayo started at third base in the first game Sunday against the Rockies upon being recalled from Triple-A Norfolk, but he's on the bench a day later while Emmanuel Rivera steps in at the hot corner. The top prospect could still see the bulk of the starts at third base while Ramon Urias (ankle) and Jordan Westburg (hand) are out, but his absence from Monday's lineup suggests everyday at-bats are far from guaranteed.