PULLMAN, Wash. (AP) - Mark Sanchez became the first USC quarterback to throw five touchdown passes in a half and the No. 6 Trojans breezed this time as a huge favorite, beating Washington State 69-0 on Saturday. It was the largest shutout victory for USC (5-1, 3-1 Pac-10) since a 69-0 win over Montana in 1931. USC's defense, ranked first in the nation coming in by allowing just 9.4 points per game, ended the Cougars' streak of scoring at 280 games dating to Sept. 15, 1984, when Ohio State beat Washington State 44-0. That scoring streak was second-longest in the nation to Michigan's 295 games. The Cougars absorbed the largest margin of defeat in school history. They began playing in 1894.