How much is a First Class stamp? http://www.radioriosfm.com.br/index.php/healthbuildie-5pjz medsystems.com.br  Johnson overtook 20th-place finisher Matt Kenseth for the Chase for the Sprint Cup lead and holds a four-point advantage with four races left. Next weekend the series heads for Martinsville, Johnson's best track statistically, and one of Kenseth's worst.