Duke (9-0) collects 30 of the 31 first-place votes and was second on the other ballot in taking the top ranking.
Indiana (9-1) had been No. 1 since the pre-season poll put was beaten Saturday by Butler 88-86 in overtime. That win allowed Butler (8-2) to enter the poll at No. 25, with North Carolina State dropping out. Indiana slips to sixth.
The Top 25 teams -- including North Carolina State but not Butler -- went 25-2 on the week. The other loss for a ranked team came when No. 8 Arizona edged firth-ranked Florida 85-64 in Tucson.
Michigan (11-0) receives the first-place vote denied Duke and is ranked second with Syracuse (11-0) moving up one spot to third and Louisville (9-1) up two to fourth. Arizona (8-0) moves to fifth.
No. 6 Indiana is followed by seventh-ranked Ohio State (8-1) and No. 8 Kansas (8-1), which are to play each other Saturday in Columbus, Ohio. Florida (7-1) drops four places to ninth and Illinois (12-0) remains 10th.
Cincinnati (10-0) moves from 12th to No. 11, swapping places with Missouri (8-1). Creighton (10-1) continues in the 13th spot with Gonzaga (10-1) again 14th and San Diego State (8-1) No. 15.
Minnesota (11-1) keeps the No. 16 ranking but New Mexico (11-0) goes from 20th to No. 17. Nevada-Las Vegas (8-1) comes in 18th with Michigan State (9-2) and North Carolina (8-2) tied for the 19th spot.
Georgetown (9-1) is voted 21st followed by, in order, Notre Dame (9-1), Kentucky (7-3), Oklahoma State (8-1) and Butler.