The USC football team has scheduled 15 days of spring football practice, starting Saturday, March 28.

The biggest story at USC is at quarterback, where the race is as open as it has been since 2003.

But that is only the beginning. A dozen starters return but even half of those names could be different come fall. (It's safe to say receiver Damian Williams, safety Taylor Mays and left guard Jeff Byers will retain their spots.)

Here is a countdown of the top 10 players to watch.

Southern California quarterback Mitch Mustain, pictured, will battle Aaron Corp and Matt Barkley - two former Orange County high school players - for starting quarterback.