For once, Cooper Flagg looked 17 years old. Duke’s freshman forward, whose polished game has made him the odds-on favorite to be the first pick in June’s NBA draft, found himself cornered by two Kansas defenders.

Flagg and Duke had their toughest test yet Tuesday night against No. 1 ranked Kansas, where they came up just short and fell 75-72. Flagg had 13 points, five rebounds and three assists, but his highlight of the night was a massive slam dunk over Kansas' Flory Bidunga.

Tyrese Proctor led Duke (4-2) with 15 points, Flagg scored 13, Kon Knueppel had 11 and Sion James finished with 10. Mayo put Kansas ahead for good when he made a jumper with 1:57 left for a 73-71 lead. Flagg hit a free throw for Duke and Rylan Griffen answered with two foul shots with 2 seconds left.