The Hoosiers are again followed in the Top 25 by Duke, Michigan and Syracuse. The only changes in Monday's poll involve the order, not who's ranked.
The Hoosiers (9-0) received 44 first-place votes from the 64-member national media panel. Duke (9-0) again drew the other No. 1 votes.
Florida and Louisville switched places at fifth and sixth. They were followed by Ohio State, Arizona, Kansas and Illinois.
The Illini (10-0) beat previously unbeaten Gonzaga on Saturday, moving into the top 10 for the first time since the next-to-last poll of 2005-06. Gonzaga dropped to 14th.
NO. 15 GEORGETOWN 89, LONGWOOD 53
In Washington, Otto Porter scored a career-high 22 points, added seven assists and four rebounds and returned after taking an apparent hit to the head during the second half of Georgetown’s win Monday night.
Porter went to the bench with 13:46 left, holding his hand to his face. He took a hit to the head during the season-opening win over Duquesne and missed the next game with “symptoms indicative of a mild concussion.” Unlike in that game, Porter didn’t leave the court area Monday.
Markel Starks was 4 for 5 from 3-point range and had 17 points for the Hoyas (8-1) while Greg Whittington had eight points.
The Hoyas used a 17-5 run over the first four minutes of the second half to pull away, forcing several turnovers in the process.
Their 30 turnovers forced was the most since Elon turned the ball over 32 times in 2003.
Georgetown has won five straight games and appears likely to stretch that streak to seven before Big East play begins. They Hoyas will host Western Carolina and American before playing at Marquette on Jan. 5.
In its first game against Longwood, Georgetown boosted its record against Big South Conference teams to 13-0 and extended its overall win streak to five games. Longwood falls to 0-7 against Big East teams and 0-8 against ranked opponents since playing its first full Division I schedule in 2004-05.
Jeylani Dublin led Longwood with 10 points.
The Hoyas had assists on their first nine field goals, building a 21-12 lead while shooting 9 of 19. They had 14 assists at halftime, three shy of their game high this season. They finished with 25 assists to set a season high.
Georgetown used two 9-0 runs in the first half, one early in the period and one late, to build a 40-24 lead.