April 9, 2022 By Reid SpencerNASCAR Wire Service MARTINSVILLE, Va. – The first night race for the NASCAR 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 .526-mile short track. Byron led 212 of the 403 laps. Teammate and pole winner Chase Elliott led the first 185 circuits, as Hendrick Motorsports surpassed 10,000 laps led at Martinsville, becoming the first Cup organiza…