Derek Carr, Raiders' frontline starters might be done playing in preseason

NAPA – Derek Carr has said he doesn't need much preseason work to prepare for games that actually count.

That's a plus for the Raiders quarterback. One drive might be all he gets.

Head coach Jon Gruden said his surefire starters might be done playing in the preseason, even with two exhibitions left.

The preseason finale's never played by major contributors. The third preseason game often represents the most extensive action starters see, but that might not be the case Thursday against the Green Bay Packers in Winnipeg at IF Field. The venue has artificial turf, and houses a CFL team and a professional soccer club, with both franchises currently in season.

"We're looking into the surface that…