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Matt Kenseth makes early move

FORT WORTH, Texas -- Matt Kenseth led the Samsung Mobile 500 after 50 laps on Saturday night, moving up to first after starting fourth. He's been battling with Greg Biffle for the lead.

There's been some pit activity and the cars have been blocked and bunched up as teams opt for two tires and quicker stops, causing plenty of traffic on pit road.

Clint Bowyer, David Ragan and Kurt Busch have been steadily in the top 5.