Washington State point guard Noah Williams took the inbounds pass and raced the length of the court, going down the lane for a layup with 10 seconds left to tie it at 63.
Without a timeout available, Tsohonis went the other way and drove into the lane, making a floater over Williams from just inside the foul line. Williams' half-court heave at the buzzer went over the backboard.
Quade Green, who averages 15.3 points for the Huskies, was out with illness and Isaac Bonton, who scores 19 per game for the Cougars, couldn't go after injuring his ankles late in their last game.