Martinez is not in the lineup for Sunday's game against the Phillies, Anthony DiComo of MLB.com reports.
Martinez is in the midst of a career-worst stretch at the plate, having gone 0-for-his-last-31, which is also the longest slump by a Mets hitter this season. He'll be on the bench for a second straight game, and Saturday's absence came against an opposing lefty starter. The 37-year-old may have played his way out of the regular lineup.