Paul hit a fadeway jumper from the left wing as time ran out. That capped a 25 point day for Paul.
The Illini led by as many as 12 points in the game before the Gophers rallied to take a four point lead.
The Illini bounced back though. D.J. Richardson's three-pointer with 47 seconds remaining tied the game at 49 and set up Paul's heroics.
The Illini are now 22-11. They'll play top seed Indiana Friday morning at 11 a.m. in the quarterfinals.