NASCAR Notebook: Johnson goes for Las Vegas jackpot

After clinching a Chase for the NASCAR Sprint Cup berth with his win at Atlanta Motor Speedway last Sunday, one might surmise Jimmie Johnson could race stress free until the opener of NASCAR's playoffs at Chicagoland Speedway on September 20.

Think again.

Johnson has a huge weight on his shoulders this weekend as he tries to pilot his No. 48 Kobalt Tools Chevrolet to victory in his sponsor's race