Stanford, although not unanimous this week, was No. 1 for the second straight week, while Duke, Michigan State, Tennessee and Kansas held second through fifth.
Then came the changes that included No. 14 Iowa returning to the rankings after a two-week absence and No. 20 Missouri moving into the Top 25 for the first time under coach Quin Snyder.
Stanford (15-0), which beat both Oregon schools in the Pac-10 by 24 points last week, received 69 first-place votes and 1,749 points from the national media panel.
Duke (15-1), which beat then-No. 10 Virginia 103-61 last week, got 1,675 points and the only other first-place votes.
Michigan State, Tennessee and Kansas held third through fifth.
North Carolina moved up three places to sixth, while Florida gained one spot to seventh. Syracuse and Georgetown (15-0) the only other unbeaten Division I team each climbed three spots to eighth and ninth, while Wake Forest, which lost to Georgia Tech in overtime, dropped four places to round out the Top Ten.
Illinois, which had been No. 7 but lost to Iowa last week, led the Second Ten, followed by Maryland, Virginia and Iowa, with Alabama and Connecticut tied at 15th. Arizona, Seton Hall, Wisconsin and Missouri followed.
The last five ranked teams were Mississippi, Oklahoma, Southern California, Iowa State and Boston College.
Iowa (14-2) moved back into the poll. The Hawkeyes, who beat Illinois and Purdue last week, were ranked for three weeks earlier in the season, getting as high as No. 19, before falling out for the last two weeks.
Missouri (12-3) was last in the Top 25 in the 1998-99 season, Norm Stewart's last as coach of the Tigers. Snyder took over last season and the Tigers moved back into the rankings following their 112-109 victory over Iowa State in four overtimes.
Texas (12-3), which had been No. 23, dropped out after two weeks following a loss at Nebraska.
Notre Dame (9-5) was one of four ranked teams to lose twice last week, falling to Seton Hall and Kentucky. The Fighting Irish had been ranked all season, getting as high as No. 10. They then lost home games to Indiana and Miami of Ohio before a four-game winning streak to close non-conference play. They lost two of their first three Big East games Syracuse and Seton Hall then lost to Kentucky last Saturday.
Besides Notre Dame, Virginia, Wisconsin and Iowa State also lost two games last week.
Iowa State and Southern Cal had the week's biggest drop, each falling five spots, while Wake Forest, Illinois and Southern California each dropped four.
Arizona, which swept the Washington Pac-10 schools by an average of 29 points, had the week's biggest jump, from 21st to 17th.
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