OAKLAND, Calif. — If the first preseason game is any indication, the Oakland Raiders can feel confident with any of their three top running backs.

The San Francisco 49ers can't feel the same about the three quarterbacks competing for the starting job.

J.T. O'Sullivan turned over the ball on his final two drives, and Alex Smith and Shaun Hill didn't perform much better as the 49ers committed four turnovers in an 18-6 loss to the Raiders last night in the exhibition opener for both.

"We feel disgusted at the turnovers," said O'Sullivan, who threw one interception and lost a fumble. "I don't remember anything except for those two plays. Those things are 100 percent unacceptable. I am disgusted about those turnovers. You can't make excuses for something like that."

The Raiders ran for 248 yards, with the most notable performance coming from Michael Bush, who had a 5-yard touchdown run in his first game since breaking his leg in college more than 23 months ago.

After being injured in the season opener for Louisville in 2006, Bush missed the rest of that season and went from a possible first-round pick to a fourth-rounder. The rehabilitation then took longer than anticipated and Bush missed all of his rookie season, as well.

He is back on the field this year and ran for 27 yards and added 29 yards receiving in his first game.

"After the game I was halfway in tears because I had not been out there in so long, like two years," Bush said. "I was happy just to get the opportunity to play again. I was happy and at the same time a little bit nervous. I was all over the place."

Justin Fargas also ran well, gaining 25 yards on five carries. Darren McFadden had 48 yards on 12 carries in his first game after being picked fourth overall by the Raiders in the draft.

SEAHAWKS 34, VIKINGS 17

MINNEAPOLIS — Matt Hasselbeck and Seattle had no problem with Minnesota's upgraded defense in the preseason opener for both teams.

Hasselbeck was 7 of 8 for 70 yards and a touchdown and the Seahawks racked up 187 total yards in three series against the Vikings' defensive starters in a preseason victory.

Maurice Morris got the start at running back ahead of Julius Jones and rushed for 62 yards on six carries in the first three drives against what was the league's top-ranked run defense last season.

With Adrian Peterson being used only as a decoy, the Vikings called passes on the first 11 plays Tarvaris Jackson was under center. He threw a 6-yard touchdown pass to new fullback Thomas Tapeh and hooked up with new receiver Bernard Berrian twice for 43 yards.

STEELERS 16, EAGLES 10

PITTSBURGH — Ben Roethlisberger was on the mark yesterday in the first preseason game for both teams.

The Steelers quarterback completed both passes he threw, a pair of 19-yarders, the second to Santonio Holmes for the game's first score to cap a brisk, eight-play, 80-yard drive.

Donovan McNabb completed 10 of 13 passes for 97 yards and a touchdown for Philadelphia.

Steelers offensive guard Chris Kemoeatu, a Kahuku alum, had one tackle.