Denny Hamlin picked up his third win of the season and first-career checkered flag at Bristol Motor Speedway Saturday night by winning the IRWIN Tools Night Race.  Hamlin passed Carl Edwards with 38 laps to go, then held off Jimmie Johnson for the top spot.  Johnson's second place run allowed him to clinch a spot in the Chase along with Greg Biffle and Dale Earnhardt Jr.  Biffle finished 19th while Earnhardt Jr. came in 12th.  Jeff Gordon came in third place, while Brian Vickers and Marcos Ambrose rounded out the top-five.  The NASCAR season features two more races in Atlanta and Richmond before the start of the Chase.