HOMESTEAD, Fla. (AP) Jimmie Johnson, on the verge of a NASCAR record fourth consecutive championship, signed a contract extension Friday to drive for Hendrick Motorsports through the 2015 season.

The announcement comes just two days before Johnson is likely to wrap up the Sprint Cup championship at Homestead-Miami Speedway. Johnson goes into Sunday's finale with a 108-point lead over Hendrick teammate Mark Martin and needs only to finish 25th or better to win the title.

"Jimmie is charting new territory in our sport, and that's due to a combination of natural talent and unsurpassed work ethic," team owner Rick Hendrick said. "How he's committed himself is just incredible, and it shows in everything that he does - not just on the racetrack.

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