SAN DIEGO (AP) — Philip Rivers threw a 22-yard touchdown pass to rookie Keenan Allen and Nick Novak kicked a 31-yard field goal to give the San Diego Chargers a 10-6 lead over the Indianapolis Colts at halftime on Monday night.

The Chargers kept the ball away from Andrew Luck and ate up much of the second quarter with the two long scoring drives.

Allen got behind safety Delano Howell and cornerback Vontae Davis on a post route for the score that completed a 12-play, 74-yard march that took 6 minutes, 14 seconds. It was Allen's second TD catch of the season.

Novak's field goal capped a drive that went 79 yards in 17 plays in 7:58. The drive was kept alive when cornerback Greg Toler was whistled for illegal contact for pushing receiver Lavelle Hawkins out of bounds on third-and-6 from the Chargers 45.

Luck then completed four straight passes to move the Colts into Chargers territory before Coby Fleener dropped a pass at the 25. Luck scrambled for 6 yards and threw an incompletion before Adam Vinatieri kicked a 50-yard field goal as time expired.

On the Colts' only other possession of the second quarter, Darrius Heyward-Bey dropped what likely would have been a long touchdown pass.

The Colts opened the game with a flea-flicker, with Trent Richardson taking the handoff and tossing the ball back to Luck, who completed a 35-yard pass to Reggie Wayne. The drive bogged down at the Chargers 11, leading to Vinatieri's 30-yard field goal.

The Colts were trying to take a two-game lead in the AFC South.

Colts coach Chuck Pagano is the older brother of Chargers defensive coordinator John Pagano.

The Chargers were without three starters: linebackers Jarret Johnson and Donald Butler, and left guard Chad Rinehart. The Colts were without safety LaRon Landry.

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AP NFL website: www.pro32.ap.org