Rivalry Week: Three key Notre Dame players to watch in USC’s last game of the regular season.

The Notre Dame Fighting Irish come to the Coliseum on Saturday with playoff birth hopes and an unbeaten record. Will the struggling USC Trojans pull off what would be Clay Helton’s biggest upset victory of his career? For that to happen, the Trojans need to shut down the following players.

At the start of the season, junior quarterback Ian Book was second string and backing up senior Brandon Wimbush.