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Charles Rex Arbogast, Associated Press
San Diego Chargers quarterback Philip Rivers (17) throws a 5-yard touchdown pass in the second half against the Chicago Bears in an NFL football game in Chicago, Sunday, Nov. 20, 2011.

SAN DIEGO — Philip Rivers says he can't recall losing five straight games in any competitive sport, unless dominoes count.

Not in high school. Not during his career at North Carolina State.

But Rivers and the San Diego Chargers have lost five straight games, the franchise's worst streak since going 0-5 to open the 2003 season.

The latest setback was a 31-20 loss at Chicago in which Rivers threw two more interceptions and Ryan Mathews had another costly fumble. The losing streak has erased the fastest start in Norv Turner's five seasons as coach and dropped the Bolts into last in the AFC West, two games behind Oakland with six to play.

The Chargers have had late-season rallies under Turner, but this year could hinge on Sunday's home game against Tim Tebow and the Denver Broncos, who have won three straight to jump into second in the division.