At 100: Martin Truex Jr. leads

FORT WORTH, Texas -- Caution for debris on Turns 3 and 4 had the field slowing up as it inched to Lap 100 in today's Samsung Mobile 500.

Martin Truex Jr., who started from the pole, is back in front. Greg Biffle follows and has had a solid car all night.

Jimmie Johnson, who has run well in recent years in Texas, has moved up from 10th to third with Matt Kenseth and Marcos Ambrose right behind him.

Tonight's biggest mover has been Jeff Gordon, who started 34th and is now running seventh. Dale Earnhardt Jr. slipped into the top-12 briefly but has hovered around 14th. He started 16th.