OAKLAND – Playing in his first preseason game, running back Taiwan Jones made a strong case for the Raiders to make him Darren McFadden's primary backup when the season begins.

In the Raiders' 31-20 win over Detroit, Jones carried 10 times for 50 yards and showed good bursts of speed on several plays. On his most impressive run, Jones looked snuffed in the backfield before spinning on a dime, reversing field to the sideline and gaining 11 yards.

"He did some nice things," said head coach Dennis Allen. "He was explosive. … That's one of the things that he gives you is he does have some real speed, so his ability to get on the edges is good for us."

Jones missed the Raiders' first two preseason games with a hamstring injury. His first touch Saturday was a 20-yard kickoff return that he brought out from about seven yards deep in the end zone. Jones later acknowledged he "probably should have kept that in," but was anxious after the layoff.

"It's time to write the résumé now to show what I can do," Jones said.

"I've been doing it all camp and I had to go out there and do it against another opponent."

Mike Goodson, also vying for the backup role, had seven carries for 18 yards a week after fumbling twice in the Raiders' loss at Arizona.

Janikowski exits – Kicker Sebastian Janikowski suffered a groin injury in the second quarter and did not return. Janikowski appeared to come up limping while pursuing Lions returner Justin Miller on Miller's 79-yard kickoff return. Janikowski continued onto the Raiders sideline and was looked at by trainers before remaining on the sideline.

"Just got a sore groin," Allen said. "We'll look at it and see where he's at, but I don't really know any more than that."

Earlier in the game, Janikowski had missed a 30-yard field goal wide left on the Raiders' first drive. He patted himself on the chest as if to acknowledge fault. Janikowski is 3 for 5 on field-goal attempts in the preseason.

Cumbie stands tall – First-year defensive tackle Jamie Cumbie, who is fighting for a roster spot, deflected three passes at the line, including one late in the fourth quarter that fellow tackle Christo Bilukidi snagged for an interception. Cumbie also sacked Lions backup quarterback Kellen Moore for a six-yard loss in the fourth quarter.

Injury report – Receivers Jacoby Ford (foot) and Denarius Moore (hamstring), linebacker Aaron Curry (knee), center Stefen Wisniewski (calf), offensive linemen Ed Wang (shoulder) and Zach Hurd (head) and defensive tackle Richard Seymour (coach's decision) did not dress.

Quarterback Matt Leinart also did not dress, still wearing a bandage on his right index finger. Leinart was throwing to Moore on the field before the game and Moore looked to be moving well.

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