CORVALLIS — When Oregon State travels to Los Angeles to try and reverse a 46-year road losing streak to Southern California, it may have to do it without its best offensive player.

CORVALLIS — When Oregon State travels to Los Angeles to try and reverse a 46-year road losing streak to Southern California, it may have to do it without its best offensive player.

Yvenson Bernard ran for 62 yards and a touchdown in the first half of Oregon State's 23-6 victory over Stanford on Saturday, but he went out with a shoulder injury and never returned.

Coach Mike Riley feared the injury was serious and that the iron-tough 5-foot-9, 201-pound tailback could miss time.

"I'm just guessing, but he seems doubtful to me," Riley said.

Bernard was scheduled to have an MRI on Monday and Riley is expected to update his status today.

With Bernard sitting in the second half, backup Matt Sieverson ran for 68 yards and Oregon State (5-3, 3-2 Pacific-10 Conference) kept Stanford at a comfortable distance while not trying anything too risky on offense.

"The way that game was, it was not necessarily artistic but it was what we had to do to win it," Riley said. "You have to play the game that you're in. It became obvious to me what kind of game this was, especially after Ev (Bernard) got hurt."

The Beavers relied on three Alexis Serna field goals to pull away in the second half, but that won't likely be enough offense against the Trojans (6-2, 3-2), who lost 24-17 to Oregon on Saturday.

Bernard, a senior who has rushed for 101.8 yards a game this season and is Oregon State's third all-time leading rusher, has been particularly important to Oregon State's success this year as it breaks in new quarterback Sean Canfield.

Bernard has been banged up before and played through injuries, and that is what has Riley nervous.

"If he's not playing, it's a pretty serious deal," Riley said.