No. 14 Purdue rallied from a slow start behind Cox, who scored 21 of his 27 points in the second half. The Boilermakers needed Cox's fourth 3-pointer with 48 seconds left to secure a 68-66 lead before holding on for the win.
Trey Kaufman-Renn briefly left with a shoulder injury but returned to contribute 11 points and 10 rebounds. Purdue avoided disaster despite committing turnovers that led to Northwestern points in the first half.