Four Associated Press Top 25 matchups headline the Week 5 college football schedule, and at least a half-dozen other games involving ranked teams are equally intriguing.

The only meeting of top-10 teams happens Saturday night when No. 3 Oregon visits No. 6 Penn State for a Big Ten showdown.

The Southeastern Conference has co-main events. No. 17 Alabama travels to No. 5 Georgia and No. 4 LSU goes to No. 13 Mississippi. The Crimson Tide have won nine of the last 10 meetings with Georgia, and the Tigers and Rebels have split their last four.

The other Top 25 game has No. 21 Southern California at No. 23 Illinois for a game that lost some luster following Indiana's 53-point demolition of the Illini .

The week's undercard is really good, too.

Washington, 3-0 and a winner of 22 straig

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