Michael Flowers poured in 27 points, Mouhamed Gueye scored eight of his 19 in overtime and Washington State handed Oregon State its 15th straight loss 103-97 on Monday night.
Flowers sank 10 of 18 shots from the floor, including 6 of 10 from 3-point range, for the Cougars (16-13, 9-9 Pac-12 Conference), who trailed 48-37 at halftime. He added six assists and five rebounds.
Washington State grabbed its first lead since midway through the first half, 72-71, on a Flowers 3-pointer with 6:30 remaining. Dashawn Davis and Dexter Akanno sank 3s on Oregon State's next two possessions and the Beavers (3-25, 1-17) stayed in front until Tyrell Roberts hit the first of two free throws for WSU with 15 seconds left to send the game to OT tied at 84.