"They picked up their intensity and got up in our face," Harberts said. "We didn't respond and stayed at the same level."
Tinkle, Mikaela Ruef and Ogwumike combined for a 20-10 run that extended Stanford's lead to 64-39. Tinkle had nine points, Ruef six and Ogwumike four. Tinkle helped the Cardinal to a 36-16 edge in the paint and a 46-33 edge on the boards.
USC managed to end Stanford's streak of holding its previous three opponents to under 50 points. The Trojans shot 31 percent from 3-point range, better than the nation-leading 24 percent that Stanford had been allowing from behind the arc.
The win completed a season sweep by Stanford, which beat USC 75-66 last month. The Trojans haven't beaten the Cardinal since a 73-72 win on Jan. 6, 2008.
"This season has been really difficult," Vaioletama said. "We come into every game like we having nothing to lose, like we can be the team to ruin everybody's season."