Raiders' 53-man roster projection features one of the NFL's best offensive lines

LAS VEGAS -- The Raiders are scheduled to open training camp on July 28 at the Intermountain Healthcare Performance Center in Henderson, Nevada, as the kickoff to their first season in Las Vegas.

Jon Gruden looks to try to make the playoffs in Year 3 of his second stint with the Silver & Black. The Raiders have only made the postseason once in the previous 17 years and haven't won a playoff game since the 2001 season. Here is a 53-man roster projection:

QUARTERBACKS (3): Derek Carr, Marcus Mariota, Nathan Peterman

Carr is coming off career highs in passing yards (4,054) and completion percentage (70.4) and will -- for the first time in his seven-year NFL career -- play in the same offensive system for the third straight season. But a slow start will get the rumor mill churning, especially if Mariota, who has had no true offseason program to get acclimated with Gruden's offense, picks up the system in short order. Might the Raiders find an extra roster spot by stashing Peterman on some sort of injury/emergency list? Stay tuned.