Memphis made it to a second week as No. 1.
The Tigers led The Associated Press' college basketball poll Monday, doubling their only other stint as a top-ranked team. In January 1983, Memphis went to No. 1 and lost hours later.
This edition of the Tigers (19-0) beat Tulsa and Gonzaga last week and stayed No. 1 with 46 first-place votes and 1,774 points from the 72-member national media panel.
Kansas (20-0), the only other unbeaten team in Division I, held second for a second straight week with easy wins over Iowa State and Nebraska. The Jayhawks had the other 26 No. 1 votes and 1,754 points.
Duke moved up one place to third, the Blue Devils' highest ranking since No. 1 in the final poll of 2005-06. North Carolina, which was No. 1 from the preseason poll until Memphis moved up following the Tar Heels' home loss to Maryland, jumped one place to fourth.
UCLA and Georgetown moved up three spots to fifth and sixth, while Tennessee, which lost 72-66 at Kentucky, dropped from third to seventh.
Michigan State moved up from No. 10 to No. 8, while Washington State dropped three places to ninth and Texas advanced two spots to round out the top 10.
Indiana, whose 29-game home winning streak was snapped by Connecticut on Saturday, dropped four places to 11th and was followed by Butler, Wisconsin, Stanford, Xavier, Drake, Marquette, Pittsburgh, Vanderbilt and Florida.
Saint Mary's (Calif.), Kansas State, Texas A&M, Mississippi and Baylor were the last five ranked teams.
Florida, Saint Mary's and Kansas State all returned to the rankings for the second time this season. They replace Dayton, Villanova and Arizona State, all losing two games last week.
Florida (18-3), the two-time defending national champion, was ranked 25th in the second poll of the regular season after losing to Florida State. The Gators returned at No. 20, having won seven of their last eight games, including an 86-64 victory over Vanderbilt on Sunday.
Saint Mary's (17-2) was No. 24 in the poll of Dec. 10, the Gaels' first ranking since the 1988-89 season. They lost at Southern Illinois in their next game and fell out until this week. Saint Mary's has won 10 of 11 since, the only loss at Texas.
Kansas State (14-4) returned to the rankings having won 10 of its last 11, the only loss at Xavier. The Wildcats, who were 25th in the preseason poll and were ranked for the first three polls of the regular season, host No. 2 Kansas on Wednesday.
Dayton (14-4) fell out from 16th after losing 69-43 to Xavier and 80-63 to Richmond last week. The Flyers were ranked for the last four weeks, reaching as high as No. 14.
Villanova (13-5) lost to Rutgers and Notre Dame last week and dropped out from 18th. The Wildcats had been ranked for 10 of the last 11 weeks, reaching as high as No. 17.
Arizona State (14-5) returned to the poll two weeks ago after not being ranked since the final poll of 1994-95. The Sun Devils lost home games to Washington and Washington State last week.