Carl Edwards, who is fifth in the NASCAR Sprint Cup Series points standings, turned in the fastest time of the opening session with a speed of 192.055 mph. His RFR teammates weren't too far behind, either.
Sam Hornish Jr., making his return to the Sprint Cup Series, was third on the afternoon. Driving the No. 12 car -- also a Ford -- for Penske Racing, Hornish finished with a best speed of 191.557 mph.
Martin Truex Jr., who finished second last weekend in Texas, piloted his No. 56 Toyota to a fifth-best time of 191.476 mph. He was on the only non-Ford in the top six.
Kyle Busch, who practiced earlier in the day for the NASCAR Camping World Truck Series, hit the wall in Turn 2 early, sending his No. 18 Toyota into the garage. Busch, who is second in the points standings, went to a back-up car, and he'll be able to start from wherever he qualifies later Friday. He finished 17th in the opening practice session.
Qualifying for the STP 400 is at 4:40 p.m. ET and is televised on SPEED. There are also two practices scheduled for Saturday, one at 10 a.m. ET and one at 2 p.m. ET.
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