Few teams have been more pleasant surprises than BYU, Duke, Indiana, Illinois and Pittsburgh, which have all started 4-0 after being picked to finish toward the bottom of their respective league standings in the preseason. But there have been disappointing starts for others. Can those seasons still be salvaged? Or has hope been completely dashed?

In one of the surprises of the new season, Florida State has crashed back to Earth, while the Gators are on course for another disappointing year.

The Big Ten on CBS will feature a top-20 matchup in Week 4 as the No. 18 Michigan Wolverines host the No. 11 USC Trojans on Saturday for a 3:30 p.m. ET kickoff. The defending national champions were blown out at home by Texas but could get themselves back into the College Football Playoff mix with a run to the Big Ten Championship Game.