NASCAR Sprint Cup Series: STP 500 Martinsville Speedway Distance: 263 miles (500 laps) Sunday, March 29 1 p.m. (ET) TV: FOX Sports 1, 11:30 a.m. (ET) Radio: MRN, Sirius XM Ch. 90 NASCAR Camping World Truck Series: Kroger 250 Martinsville…
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