By RALPH D. RUSSO
AP College Football Writer
LSU has moved up to fifth and Southern California is sixth in the College Football Playoff rankings behind Georgia, Ohio State, Michigan and TCU. The top four remained the same for the third straight week, but the teams chasing changed order after Tennessee lost to South Carolina last Saturday night. Two huge games this weekend could create more clarity. Michigan is at Ohio State and USC hosts Notre Dame, which checked in at 15th in the selection committee’s rankings.