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.
Chevez Goodwin had 20 points and 12 rebounds, Drew Peterson added 15 points and fifth-ranked Southern California rallied in the second half to defeat Oregon State 81-71.
USC, Washington State and Washington have all dismissed coaches before the end of the season. But it's likely that there are more coaching changes afoot in the Pac-12.
Cooper Kaifes hit a go-ahead 3-pointer with 1:21 left in the game, Jerome Marshall followed with a layup and Samford held off Oregon State 78-77 in nonconference play.
Freshman Greta Kampschroeder scored all 13 of her career high points in the decisive third quarter and No. 15 Oregon State turned back California Baptist 80-72.
The Ducks can clinch the Pac-12 North title and a spot in the conference championship game with a win over Washington State on Saturday combined with a Stanford victory over Oregon State.
Josh Scott, Askia Booker and Jaron Hopkins all scored 13 points, and No. 20 Colorado hung on to beat Oregon State 64-58 Thursday night in the Pac-12 opener for both teams.