John Hart had played 33 minutes of basketball for No. 13 Purdue this season before Tuesday night's game against Illinois.
Hart wasn't even listed in the game's official score book, costing the Boilermakers a technical foul and two points at the free throw line when he did play. The Illini said they knew nothing about him.
Hart more than made up for the technical and introduced himself to Illinois with 14 points, five of them in an early second-half run that gave the Boilermakers a lead they rode to an 84-78 victory.
"Our guy obviously made a mistake and he wasn't in the score book,"' Purdue coach Matt Painter said. "It cost us two points. It's a pretty good trade out."
JaJuan Johnson led Purdue with 24 points.