- Associated Press - Tuesday, September 11, 2012

OAKLAND, CALIF. (AP) - Philip Rivers threw a 6-yard touchdown pass to Malcom Floyd and the San Diego Chargers took a 10-6 halftime lead over the Oakland Raiders on Monday night in the season opener for both teams.

The Chargers took advantage of three Raiders penalties that led to first downs on the 13-play, 90-yard drive late in the second quarter. Rivers completed a 17-yard pass to Antonio Gates on third-and-5 to move to Oakland’s 7-yard line before finding Floyd on a short toss on another third down.

Darren McFadden already caught a career-high eight passes for 68 yards to go with 35 yards rushing for the Raiders, who settled for field goals of 51 and 20 yards by Sebastian Janikowski.

Familiar mistakes flared up again for the Raiders.

Nose tackle Tommy Kelly handed San Diego two first downs on the touchdown drive when he jumped offside on two short third downs. Tyvon Branch also gave the Chargers another first down on a holding penalty.

The Raiders set an NFL record with 163 penalties last season, giving opponents 58 first downs by penalties.

Rivers avoided a sack and bought time in the pocket to find Floyd in the front of the end zone. Floyd dunked the ball through the uprights and waved his hands at the Black Hole side of the Oakland Coliseum after giving San Diego a 10-3 lead.

The Raiders nearly rallied for a tying touchdown before halftime.

On third-and-15 from San Diego’s 16, McFadden took a short pass from Rivers and burst up the middle, splitting two defenders and diving a yard short of a first down with 7 seconds left. The replacement referees initially ruled McFadden had the first down until the replay booth overturned the call and set up a fourth-and-short.

The 14-play, 77-drive ended with Janikowski’s 20-yard field goal.

Robert Meachem made a diving, 46-yard catch from Rivers at Oakland’s 20 in the first quarter. After Rivers sailed passes to Floyd and Gates in the end zone, the Chargers settled for tying 23-yard field goal by Nate Kaeding.

Oakland had plenty of production from the offense but no points.

Darrius Heyward-Bey took a short pass from Carson Palmer for 13 yards and McFadden caught a 9-yard pass before the drive stalled. Janikowski stayed steady despite a high snap and kicking from the infield dirt at the Coliseum _ shared by baseball’s Oakland Athletics _ to boot a wobbly line drive through the uprights.

On Oakland’s opening possession, Rod Streater caught Palmer’s pass over the middle for what would have been a first down on third-and-4. As Streater spun around, Melvin Ingram came from behind to knock the ball lose and Antwan Barnes recovered at San Diego’s 29.

But the Chargers couldn’t capitalize on the turnover. Ronnie Brown caught a 4-yard pass, was stuffed for no gain and Matt Shaughnessy and David Tollefson sacked Rivers to force a punt.

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