Fortes is out of the lineup for Wednesday's game against the Diamondbacks, Kevin Barral of FishonFirst.com reports.
Flores had started each of the Marlins' last four games behind the plate, so he'll be getting a breather for the series finale. Ali Sanchez will step in at catcher in place of Flores, who has been swinging a hot bat lately with a .998 OPS over his last 11 games.