Duke returned to No. 1 in The Associated Press college basketball poll Monday, while four schools moved into the Top 25 after a week in which ranked teams lost 17 games.
The Blue Devils (14-1) had been on top of the poll all season, including five straight weeks as a unanimous choice, until the loss at Florida State dropped them one spot.
Kansas took over at No. 1, but the Jayhawks (13-2) were there just one week. They lost 87-77 at UCLA on Saturday to snap a 13-game winning streak and dropped to fourth.
Florida (14-1) and Maryland (13-2) each moved up one place to second and third.
Duke, which plays host to Maryland on Thursday night, received 50 first-place votes and 1,776 points from the national media panel. The Gators, who have won 13 straight games, were No. 1 on 21 ballots and had 1,744 points.
Maryland, with one, was the only other team to receive a first-place vote.
Four teams joined the Top 25 this week: Southern California and Indiana had been ranked before this season; Georgia and Oregon are both in for the first time.
Oklahoma and Oklahoma State held fifth and sixth and were followed in the Top Ten by Cincinnati, Syracuse, UCLA and Virginia.
Illinois dropped two spots to No. 11 and was followed by Kentucky, Gonzaga, Wake Forest, Arizona, Alabama, Iowa, Southern California, Stanford and Georgia.
The last five ranked teams were Missouri, Boston College, Oregon, Miami and Indiana.
Michigan State (9-7), which has lost four straight, fell out from 25th, the first time the Spartans haven't been ranked since Jan. 25, 1998, a run of 72 consecutive polls. Last season, the third straight Michigan State reached the Final Four, the Spartans were in the top five all season, reaching No. 1 for two weeks.
The other teams to fall out -- No. 22 Mississippi State, No. 23 Pittsburgh and No. 24 Butler -- had much shorter stays in the Top 25. Mississippi State and Pittsburgh were ranked for one week, Butler for three. Butler hadn't been in the poll since the 1948-49 season.
Southern California (13-2) was ranked 20th in the preseason poll and 24th in the first of the regular season before falling out. The Trojans have won nine straight games, the last an emotional 81-77 victory over UCLA last Thursday.
Georgia (14-2) last appeared in the poll for one week a season ago. The Bulldogs came in this week having won three straight, the middle one just their third victory ever at Kentucky.
Oregon (12-4) has won eight of nine since losing three straight to Massachusetts, Portland and Minnesota. The Ducks, who were last ranked for a two-week stint in 1999-00, have two wins over Arizona and another over Stanford in their last six games.
Indiana (11-5) returned to the rankings after being out for the last four weeks. The Hoosiers have won four straight, including last week's victories over Michigan State and Iowa, since losing three of four.
Michigan State and Mississippi State were the only ranked teams to lose twice last week. The Spartans lost to Indiana and Wisconsin, the latter ending the nation's longest home winning streak at 53 games. Mississippi State fell to Arkansas and Mississippi.
Gonzaga, which again had its highest ranking in school history, Arizona and Alabama made the week's biggest jumps, all moving up five spots to be 13th through 15th.
The Maryland-Duke game is one of 10 this week between ranked teams, with Kansas at Oklahoma State on Tuesday and Oklahoma at Kansas on Saturday, also between top five teams.