Jacob Pullen scored a career-high 38 points and Kansas State shot 56 percent from the field Monday night en route to a stunning 84-68 victory over Kansas, which moved to No. 1 just hours earlier.

Pullen, a 6-foot senior who ranks in the top five in 17 career categories for Kansas State, had 23 points in a take-charge first half that propelled the Wildcats (17-9, 5-6 Big 12) to a nine-point halftime lead.

Hundreds of fans stormed the court when the buzzer sounded on Kansas State's third victory in its last 45 games against an archrival that has dominated the Wildcats for decades.

The Jayhawks (24-2, 9-2) replaced Ohio State atop the Associated Press poll, a position they held for 15 weeks last season.

Kansas beat Kansas State 90-66 on Jan. 29, but this time the Wildcats, led by an indomitable Pullen, took control from the start.

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Jacob Pullen and the Kansas State Wildcats were unfazed by Kansas' newfound No. 1 ranking in the first half in Manhattan. Pullen finished the first half with 23 points, helping the Wildcats to a 42-33 lead at the break.

K-State, who led by as many as 14 points, also took care of business on the defensive end, forcing 11 KU turnovers in the half.

Marcus Morris is leading the Jayhawks with 10 points.

Tyrel Reed and Brady Morningstar helped KU get back in the game, chipping away at the Wildcat lead with sharp shooting toward the end of the half.