Busch got free entering Turn 3 at the 1.366-mile asphalt track, which narrows by 17 feet in Turns 3 and 4. The right side of his car slammed into the wall, causing significant damage.
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Busch, who owns four top 10s and a 6.8 average finish in the last five races at Darlington, finished 11th in a backup car after wrecking in practice at Michigan on Aug. 15.
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