Denny Hamlin claimed his second Sprint Cup Series win of the season by taking Sunday's STP 400 at Kansas Speedway.  Martin Truex Jr. dominated the race by leading 173 of 267 laps, but Hamlin grabbed the top position with 31 laps remaining and took the checkered flag by 0.7 seconds.  Truex was trying to end his 174-race winless streak.  Hamlin's first win this season came in March at Phoenix.  He joins three-time and defending series champion Tony Stewart as the only repeat winners at this point of the season.  Jimmie Johnson finished third, followed by Matt Kenseth and current points leader Greg Biffle.