Diaz is not in the starting lineup for Sunday's game against the Phillies, Ryan Bass of Rays.tv reports.
Diaz is the Rays' catalyst atop the order, and the team will rest him for the final game of the regular season ahead of what they hope is a deep playoff run. Liam Hicks will serve as the designated hitter while Nick Fortes catches and Victor Mesa leads off against right-hander Zack Wheeler.