After Lewis put the Niners ahead for the first time since late in the first half, an opportunistic defense spearheaded by Ulbrich (six tackles) stymied the Raiders by limiting Oakland to just three first downs on its final five drives and forcing two turnovers in the fourth quarter.
"It's a whole lot of fun playing with these young guys," said Ulbrich, a second-year player who was on the field with several rookies as the Niners protected their lead with the game on the line. "They have so much energy. Guys are out there excited, playing with passion. It was everybody. It's just a whole lot of fun playing with those young guys."
Rookie Quincy Stewart put a hit on running back Jabari Jackson that forced a game-clinching fumble on Oakland's final drive, and cornerback Stephen Fisher had an interception that stopped the Raiders after a nine-play drive earlier in the fourth quarter.
Other Niners highlights:
--- Star receiver Terrell Owens made a spectacular over-the-shoulder catch to complete a 38-yard scoring pass from quarterback Jeff Garcia that put the Niners ahead 7-0 midway through the first quarter. Owens made the grab with cornerback Eric Allen draped on his back.
--- Second-year defensive end John Engelberger had two crunching sacks, giving him three for the preseason.
--- Veteran safety Zack Bronson had four tackles and returned a goal-line interception 51 yards.
--- Halfback Garrison Hearst's comeback from a two-year layoff continued on course as he gained 27 yards on six carries.