The Oklahoma State baseball team built up an early lead against the second-ranked Bruins, hoping to maintain it throughout the game.
Once coach Josh Holliday took out pitcher Jensen Elliot, the game went downhill.
UCLA scored four runs after Eilliot was taken out and defeated OSU 6-3 on Saturday in Los Angeles.
The Cowboys (8-5) started early with an RBI-single in the first inning from Colin Simpson.
UCLA (10-3) matched OSU in the bottom of the first with a run of its own.