Chicago ? When Luther Head came off the floor after pregame warmups, he realized he’d forgotten to put his uniform jersey on.

It might have been No. 1 Illinois’ only lapse of the day.

Head had a season-high 23 points on 8-of-10 shooting, and all five starters reached double figures to lead Illinois to an 83-66 rout of Oregon (4-1) on Saturday at the United Center.

Deron Williams added 17 and seven assists, Dee Brown had 13 points and James Augustine had 10 points and eight rebounds. Roger Powell Jr. finished with 12 points despite spending most of the first half on the bench because of foul trouble.

“If you have any type of slippage whatsoever, they really make you pay,” Oregon coach Ernie Kent said.

This is the third time in school history Illinois (9-0) has been ranked No. 1, but it’s never been able to stay on top for more than a week. The Illini should break that streak now, winning all three of their games this week in convincing fashion.

No. 3 Georgia Tech 64, Air Force 42

Atlanta — Luke Schenscher scored 15 points, and Georgia Tech overcame Air Force’s slow-paced offense. The Yellow Jackets (6-0), attempted a season-low 40 shots and failed to make a three-pointer for the first time since 1987.

No. 4 Syracuse 86, Binghamton 56

Syracuse, N.Y. — Hakim Warrick scored 20 points, Gerry McNamara added 18 and Syracuse (8-1) bounced back from its first loss of the season with a victory over Binghamton (2-5). Andre Heard led Binghamton with 17 points.

No. 10 Kentucky 73, Indiana 58

Louisville, Ky. — Patrick Sparks scored 16 points, and Kentucky (6-1) won its fifth straight game in its annual series against Indiana (2-4). Bracey Wright led Indiana with 31 points. The Hoosiers have lost four straight games.

No. 11 Pittsburgh 84, Penn State 71

State College, Pa. — Carl Krauser scored a career-high 28 points for Pitt (7-0), and the Panthers beat the Nittany Lions (5-4) for the fourth consecutive season. Aaron Johnson had 17 points for Penn State.

No. 12 N.C. State 94, Liberty 60

Raleigh, N.C. — Julius Hodge scored 27 points and added nine rebounds and nine assists for the Wolfpack (7-0), who matched their best start under ninth-year coach Herb Sendek.

The Flames fell to 1-5.

No. 13 Louisville 74, Florida 70

Gainesville, Fla. — Taquan Dean scored 22 points, Francisco Garcia added 19, and Louisville (5-1) withstood a late rally by Florida (5-2).

Rick Pitino improved to 20-1 against former assistant coaches and players, extending his record to 6-0 against Billy Donovan.

No. 15 Arizona 67,

Utah 62

Tucson, Ariz. — Channing Frye scored 19 points despite foul trouble for Arizona (6-2). The victory was the 1,000th for coach Lute Olson in 47 years at the high school, junior-college and major-college level. Andrew Bogut had 20 points and 10 rebounds for Utah (5-3).

No. 18 Alabama 75, Temple 71

Tuscaloosa, Ala. — Earnest Shelton scored 22 points, and Alabama hit six of 10 free throws in the final 62 seconds. The Tide (8-1) led by 12 points early in the second half, but the Owls (3-4) — paced by Mark Tyndale’s 22 points and seven rebounds — rallied with seven three-pointers in the first 13 minutes after the break.

No. 20 Michigan St. 78, Stanford 53

Auburn Hills, Mich. — Paul Davis scored 20 points, and Michigan State (5-2) took control with an early 18-4 run.

No. 21 G. Washington 79, St. Francis, Pa. 65

Loretto, Pa. — Pops Mensah-Bonsu scored 17 points, and George Washington (6-1) used a 20-2 run to take control against St. Francis (4-3).

No. 22 Mississippi St. 83, Arkansas-Little Rock 53

Starkville, Miss. — Lawrence Roberts scored 21 of his 27 points in the first half to lead Mississippi State. Roberts keyed a 21-0 spurt which helped Mississippi State (7-2) seize control against Arkansas-Little Rock (4-4).

Marquette 63,

No. 24 Wisconsin 54

Milwaukee — Travis Diener scored 29 points in leading unbeaten Marquette (9-0) past the Badgers (5-2).

No. 25 Gonzaga 75, Saint Louis 45

Spokane, Wash. — Adam Morrison scored 20 points for Gonzaga (7-1).