Both teams have been ranked 1-2 for seven straight weeks.
Illinois and Kansas were ranked 1-2 in The Associated Press' college basketball poll Monday for the seventh straight week, the longest such run in 6 years.
The Illini (18-0) beat Penn State and Northwestern last week for the best start in school history. They received 58 first-place votes and 1,759 points from the national media panel.
Kansas (13-0) won road games against Iowa State and Colorado to hold second place for the ninth straight week -- the Jayhawks were No. 1 in the preseason poll and the first of the regular season. They were No. 1 on the 13 other ballots and had 1,710 points.
The last time two schools were 1-2 for this long was when Connecticut and Duke did it for 8 weeks in the 1998-99 season. They switched places the next two polls.
Wisconsin was the week's lone newcomer at No. 24, jumping back in after a five-week absence and replacing George Washington, which fell out from No. 21.
Wake Forest, Duke and Oklahoma State each moved up one spot to third through fifth, while North Carolina, which lost 95-82 to Wake Forest on Saturday, dropped from third to No. 6.
Syracuse stayed seventh and Kentucky moved up one spot to No. 8.
Boston College continued its impressive climb, moving to No. 9, its highest ranking since being seventh in the final poll of 2000-01.
The Eagles (14-0), along with Illinois, Kansas and Duke (13-0) -- the only unbeatens in Division I -- moved into the rankings two weeks ago at No. 25, then jumped to 13th last week. The Eagles won 73-53 at West Virginia in their only game last week.
Washington moved up four spots to round out the Top 10.
Beyond the Top 10
Gonzaga jumped five places to 11th, while Georgia Tech, which lost to North Carolina and North Carolina State last week, dropped from eighth to No. 12.
This is the first week out of the Top 10 for the Yellow Jackets (11-4), who were No. 3 in the preseason poll.
Arizona was 13th and was followed by Louisville, Texas, Connecticut, Mississippi State, Oklahoma, Michigan State and Cincinnati.
The last five ranked teams were Pittsburgh, Alabama, Iowa, Wisconsin and Marquette.
Wisconsin (12-3) came in off a dramatic 62-59 win over Michigan State. The Badgers scored the last 11 points of the game to extend their home winning streak to 38 games, the longest in the country.
George Washington (11-3) dropped from the Top 25 after a 76-74 overtime loss to Massachusetts at home Saturday. The Colonials were ranked for six straight weeks, reaching as high as No. 19.