Philip Rivers got his big-money contract extension. Now all he needs to do to keep up with Eli Manning and Ben Roethlisberger is to win the Super Bowl. Rivers signed a six-year contract extension Monday with the San Diego Chargers worth US$93 million, with $38 million guaranteed. A person familiar with the contract confirmed the numbers to The Associated Press, but requested anonymity because the team did not release any figures. The deal goes through 2015. Rivers is coming off his best pro season, when he threw 34 touchdown passes to tie former teammate Drew Brees for the NFL lead and break Hall of Famer Dan Fouts’ Chargers record. He also led the NFL with a quarterback rating of 105.5, another team record. He had 4,009 passing yards, joining Fouts as the only QBs in team history to throw for more than 4,000 in a season.