The first night race for the Cup Series at Martinsville Speedway was a cakewalk for Hendrick Motorsports — until a late caution sent the race to overtime, that is.
But William Byron survived a final restart and a mistake on the white-flag lap to win Saturday night’s Blue-Emu Maximum Pain Relief 400 at the 0.526-mile short track.
Byron led 212 of the 403 laps. Teammate an...
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