Brock Motum had 20 points and 11 rebounds as last-place Washington State upset No. 23 UCLA 73-61 on Wednesday night, breaking a 19-game home losing streak to the Bruins that extended to 1993.
Royce Woolridge added 19 points for Washington State (12-18, 3-14 Pac-12), which also broke a nine-game losing streak that had put coach Ken Bone on the hot seat.
Jordan Adams scored 18 points for UCLA (22-8, 12-5), which had won four straight games and came into Wednesday tied with Oregon for first place in the Pac-12.
Washington State had lost its last eight games against the Bruins, who were coming off a win over No. 18 Arizona.
Washington State played without Mike Ladd (knee injury) and DaVonte Lacy (knee injury), their second- and third-leading scorers.
It didn't seem to matter, as the Cougars sliced up the Bruins inside for easy layups much of the game. They held the Bruins 15 points below their scoring average, and outrebounded them 46-23. The Bruins shot just 38 percent in the game, compared to 49 percent for WSU.
Washington State scored the first seven points of the game, and then made four straight layups to build a 15-2 lead. The Bruins made only one of their first 10 shots.
The Bruins did not score their second field goal until there was 10:26 left in the first half and they trailed 19-4.
Washington State extended the lead to 25-4 with 8:28 left. The Cougars made 10 of their first 18 shots.
Shabazz Muhammad made a 3-pointer to get the Bruins into double figures at 25-12, but Woolridge replied with a 3 for WSU.
Adams scored the last five points of the first half for the Bruins, on two free throws and a 3-pointer, but Washington State led 35-24. The Cougars shot 48 percent in the first while holding UCLA to 30 percent in the first.
Muhammad's 3-pointer cut WSU's lead to 37-31 early in the second. D.J. Shelton scored three straight baskets for WSU to push the lead back to 43-33.
Layups by Woolridge and Motum gave WSU a 56-42 lead with 7 minutes left.
Two 3-pointers helped the Bruins cut WSU's lead to 60-52, but the Cougars made their free throws to stay ahead.
UCLA averages 76 points per game to lead the Pac-12.
The Bruins hold a 102-15 lead in the all-time series.