MANHATTAN —Marcus Foster scored 20 points, including two free throws in the closing seconds of overtime, and Kansas State held on to beat No. 7 Kansas 85-82 on Monday night.Will Spradling added 15 points for the Wildcats (17-7, 7-4 Big 12), who blew a nine-point lead with less than 2 minutes left in regulation, only to survive for just their third win over the Jayhawks (18-6, 9-2) in 26 games played at Bramlage Coliseum.Hundreds of students flooded the court when the final buzzer sounded to celebrate the end of a six-game skid against Kansas. The Wildcats, who had lost 48 of the last 51 in the series, hadn’t beaten their rivals in their on-campus octagon since Feb. 14, 2011.Andrew Wiggins scored 16 points for the Jayhawks, including a putback of his own miss with 6.9 seconds left to force overtime.