The Tigers (6-0), who had been unranked this season but first among "others receiving votes" last week, scored a decisive 41-26 win at Georgia.
Alabama (6-0) remains No. 1, taking 58 of the 62 first-place votes. Oregon (6-0) receives three first-place mentions and is second with Ohio State (6-0) in third. The final first-place vote goes to fourth-ranked Clemson (6-0).
Those four teams are ranked the same as last week. The only other team in the Top 25 that stays in the same place is No. 23 Northern Illinois. Every other team is in a different position and most by more than two spots.
Georgia's loss to Missouri cost it nine places to 16th while Stanford, which lost to Utah, drops eight spots to 13th. Oklahoma, after a loss to Texas, falls eight places and its 18th and Michigan, losing at Penn State, falls from 16th to No. 24. Northwestern, 18th last week, drops out of the Top 25.
Florida State (5-0) goes from sixth to No. 5 this week and Louisville (6-0) is up two to eighth. Texas A&M (5-1) is voted seventh after a week at No. 9 with Louisiana State (6-1) in eighth, South Carolina (5-1) ninth and UCLA (5-0) making the Top 10. LSU, South Carolina and UCLA are all up three spots.
No. 11 Miami (Fla.) (5-0) and 12th-ranked Baylor (5-0) are both also up three, coming in ahead of Stanford (5-1) and Missouri (6-0). Texas Tech (6-0) moves to 15th, an improvement of six places.
Georgia (4-2) drops to 16th but Oklahoma State (4-1) is up three to No. 17 and ahead of in-state rival Oklahoma (5-1). Fresno State (5-0), 22nd a week ago, takes the No. 19 place and Virginia Tech (6-1) is up five to 20th.
Nebraska (5-1) comes in 21st with Florida (4-2) in 22nd and Northern Illinois (6-0) again 23rd. Michigan (5-1) is down eight to 24th and Washington (4-2) is down six to 25th.
Florida State goes to Clemson for the headline game of this week in college football. Also, UCLA is visited by Stanford and Florida is to play at Missouri.
McPhee, Cokas 'working on their marriage' after affair
Beautician charged with giving client fatal silicone butt injection