SAN DIEGO -- The Dallas Cowboys face the San Diego Chargers in the second game of the preseason. Here's a preview:

Who's not playing: It would take you an hour to figure out who's not playing for the Cowboys. We give you the highlights: OLB DeMarcus Ware, OLB Anthony Spencer, WR Miles Austin, TE Jason Witten, G Nate Livings, NT Jay Ratliff and C Phil Costa are the projected starters who will miss the game.

The starters play how much, again?: Jason Garrett wanted the first-team offense to go about 8-to-10 plays in the preseason opener at San Diego. Tonight, maybe into the second quarter, with center David Arkin expected to go into the third, maybe fourth quarter. When Arkin comes out, expect Harland Gunn to take over the center snaps. With second-team tackle Jermey Parnell out, Jeff Adams slide in and take some snaps. Safety Barry Church played with the second team a little bit at Oakland. It could continue again.

Who needs to play well: It's easy to say everybody, but based off the Raiders game and the last two days of practice, we've come up with a few names: WR Raymond Radway, CB Morris Claiborne, DE Marcus Spears, DE Kenyon Coleman, CB Mario Butler and G Ronald Leary.

Mo debuts: First-round pick Morris Claiborne will make his NFL debut at the Chargers. He's not sure if he'll start, but it wouldn't surprise anyone if the Cowboys come out in a three-cornerback setup with Orlando Scandrick and Brandon Carr alongside Claiborne. The rookie needs the snaps against different competition and he might play the entire first half. He's battled Dez Bryant, Kevin Ogletree among others for nearly two weeks of practices, when he's been healthy, so it will be interesting to see him against someone else.

About the series: If you're scoring at home, this is the 14th meeting between the teams. Dallas holds the preseason series advantage at 7-6. The Chargers won the last meeting, in 2009, 20-17.