Sean Mannion returned with a chance to lead Oregon State to a mark never before reached in school history.
Instead, the biggest surprise in the Pac-12 Conference this season finally stumbled, and that was because of shaky play from its quarterback.
Bishop Sankey ran for 92 yards and two touchdowns, Travis Coons kicked a 30-yard field goal with 1:20 left and Washington took advantage of four interceptions from Mannion in a 20-17 upset of the seventh-ranked Beavers on Saturday night.
''It was a combination of things that went wrong,'' Mannion said. ''I misread some things. I'll learn from it and make better plays next time.''
Oregon State (6-1, 4-1 Pac-12) was trying for the first 7-0 start in school history. Instead it became the second AP Top 10 team to be upset by the Huskies at home this season. Washington knocked off then-No. 8 Stanford 17-13 in late September.
Washington's pride was wounded after three straight losses to Oregon, USC and Arizona by a combined score of 128-52...