Eugene Leoni and Karl Morgan of UCLA sacked Southern California's quarterback on a two-point conversion attempt with no time left in the game to preserve the 11th-ranked Bruins' victory in Pasadena, Calif.
"We have nothing to complain about," said USC Coach John Robinson. "We came to win, not to tie."
A crowd of 95,736 at the Rose Bowl watched Scott Tinsley throw a one-yard scoring pass to Mark Boyer as time ran out to put the Trojans into a position to win.
Tinsley, who took over the starting quarterback position when Sean Salisbury was injured last month, took the blame for the conversion failure.
"I held the ball too long," he said. "I should have drilled it to someone to give us a chance. The rush was coming from the inside. I had enough time.
"We had three potential receivers. They played a zone defense. We were here to win. There was never a thought of kicking to tie."
The victory in the regular-season finale for the 11th-ranked Bruins raised their Pacific-10 Conference record to 5-1-1 and their overall mark to 9-1-1. The 15th-ranked Trojans, who face 18th-ranked Notre Dame in their final game next Saturday, are 5-2 in league action and 7-3 overall. USC is ineligible for postseason competition because of NCAA sanctions.