Xfinity 500

The Xfinity 500 is a NASCAR Cup Series stock car race held at Martinsville Speedway in Ridgeway, Virginia, the other one being the Blue-Emu Maximum Pain Relief 500 in April, The race has been run in every NASCAR Cup Series, starting with the inaugural 1949 season, making it the oldest NASCAR race still run today. It is the ninth race of ten in the Cup Series playoffs, and the final race of the Round of 8. Starting 2015, NBC has the rights for the final 20 races of the season (19 of 20), including this race. Chase Elliott is the defending winner of the event.

Prior to lights being installed, the race started at 1:30 pm. Eastern start time, the earliest start time among the playoff races on the current schedule (as the three playoff races after Martinsville start at 3:00 pm EST, five of the first six start at 2:00 pm EDT, and Charlotte starts at 2:00 pm EDT) in an attempt to finish the race before darkness. After a series of incidents involving both the October Late Model race and the NASCAR premiership races in October or November in recent years, most notably both fall 2015 races that ended in near-darkness, the track added lights for the 2017 season. The NASCAR Cup Series fall race now finishes at night, and the Late Model race is held at night. The Tums sponsorship returned sponsorship for 2008, as their Goody's Powder brand sponsored the race from 1983 to 1995 and recently returned as sponsor for the spring race. As per Martinsville tradition, the winner of this race receives a custom-built grandfather clock.

Track length notes

 * 1949–1968: 0.5 mile course
 * 1969, 1984–present: 0.526 mile course
 * 1970–1983: 0.525 mile course