Toby Gerhart and Stanford did to the Oregon defense what the Ducks did a week ago to Southern California, opening up the Pacific-10 Conference race with a program-defining victory.

Gerhart ran for a school-record 223 yards and three scores, Andrew Luck threw for two touchdowns and Stanford held on to beat No. 7 Oregon, 51-42, Saturday to become bowl eligible for the first time in eight years.

“This was definitely my biggest win since I’ve been here at Stanford,” Gerhart said, ranking it ahead of the victory over No. 2 USC two years ago.

“I think it’s definitely bigger than the USC win because it gets us to that bowl game. All our seniors, the goal coming in was to be a bowl team. This was by far the biggest win. The students storming the field, that was an awesome feeling.”

Stanford had lost in its prior five games with a chance to become eligible for a bowl and now is in position to play a postseason game for the first time since Tyrone Willingham’s final year in 2001 after snapping a seven-game losing streak to the Ducks.

The loss by Oregon (7-2, 5-1 Pac-10) just a week after gaining 613 yards in a 47-20 win over USC cost the Ducks any shot at a berth in the Bowl Championship Series title game and took away any margin for error if they want to win the conference outright.

Oregon rallied with two late touchdowns to cut a 20-point lead down to six, but Stanford (6-3, 5-2) recovered an onside kick with 2:38 to go and tacked on Nate Whitaker’s third field goal with 11 seconds remaining to seal the win.

“We got beat by a better team,” coach Chip Kelly said. “If you say we got caught looking behind or looking ahead, it takes away from Stanford. Stanford is a heck of a football team.”

Luck took advantage of vast open areas in the middle of the Oregon defense, completing four passes of at least 20 yards in the first half alone. Even when the Ducks had good coverage, Luck managed to connect with his receivers downfield.

He finished 12 for 20 for 251 yards, throwing an 8-yard touchdown pass to Jim Dray in the second quarter and a 31-yarder to Chris Owusu after Oregon cut the Cardinal lead to 10 points early in the third quarter.

“Just an unbelievable performance by Andrew,” Harbaugh said. “I don’t know how you can play better. How can you play better as a quarterback? What can you say he should have done better? Who could have done better?”

The Ducks cut their deficit to 10 on a 3-yard keeper by Jeremiah Masoli, before Gerhart carried Oregon defenders into the end zone on a 17-yard run that made it 45-28 late in the third quarter.

Gerhart had 38 carries, punishing Oregon defenders on each run.

Oregon State 31, at No. 23 California 14: Sean Canfield threw for 342 yards and two touchdowns and ran for a score in the Beavers’ victory over the Bears, who lost star tailback Jahvid Best to a concussion after he took a scary fall.

Cal (6-3, 3-3) couldn’t recover from seeing Best land on his head in the end zone after a leaping touchdown over a defender in the second quarter. The Golden Bears, who had won three straight to get back in the Top 25 for the first time following a four-week absence, lost their fifth straight at home to the Beavers — and this one made Oregon State (6-3, 3-3) bowl eligible.

No. 12 USC 14, at Arizona State 9: Will Harris returned an interception 55 yards for a score, Matt Barkley threw a 75-yard pass to Damian Williams for another score, and the Trojans held on for a shaky victory over the Sun Devils.

Coming off the worst loss in Pete Carroll’s tenure, the Trojans (7-2, 4-2) barely survived on a night they produced little on offense. The victory kept the Trojans in the hunt for an eighth straight Bowl Championship Series berth.

USC’s defense was the reason the Trojans beat ASU (4-5, 2-4) for the 10th straight time.