We are down to the final race in the Round of 8 in 2021 NASCAR Cup Series Playoffs at Martinsville Speedway. This will be the final opportunity for seven drivers to claim one of three remaining spots in the 2021 Championship 4 Round. The green flag drops on the 2021 Xfinity 500 on Sunday at 2 p.m. ET. Five of the eight drivers in the current postseason field have previously won at Martinsville Speedway. 

Kyle Larson, listed at 15-2 odds in the latest Xfinity 500 odds from Caesars Sportsbook, is the only driver to have clinched a spot in the ChampionshIp 4 Round. He won the first two races in the Round of 8 at Texas and Kansas. Chase Elliott, listed at 6-1 odds, is currently in second place in the points standings, and he won the playoff race at Martinsville in 2020 en route to winning his first Cup Championship. Denny Hamlin, also listed at 6-1 odds, is in third place in the standings and has won five times at Martinsville, which leads all active drivers. 

Before making any 2021 Xfinity 500 picks, you NEED to see what SportsLine's Micah Roberts has to say. Roberts, a former Vegas bookmaker, was the first to offer expanded NASCAR betting, and now hands out NASCAR winners to his followers on SportsLine. Roberts is the nation's premier NASCAR betting expert, and his top pick, Chase Elliott, won the Jockey Made in America 250 in July at 2-1 odds. 

He also correctly predicted the Coca-Cola 600 winner in the final event of May, hitting Larson's win at 11-2 odds. The previous week, he was on point at the EchoPark Texas Grand Prix, targeting Elliott as the winner at 8-5 odds. 

Now, Roberts has analyzed Sunday's Xfinity 500 starting grid. We can tell you he is fading Larson, even though he became just the fourth Cup driver and the first since Dale Earnhardt Sr. (1987) to win three straight races more than once in a season last week. In fact, he says Larson barely cracks his top 10!

Instead, Roberts is high on a long shot outside of the playoff field who has two Top 5 finishes in his last four Martinsville starts! This driver is being underestimated by oddsmakers, and anyone who bets on him could hit it BIG. You ABSOLUTELY need to see who it is before making any picks.

So who wins the Xfinity 500 2021? And which enormous long shot stuns NASCAR? ... Join SportsLine right now to see Micah Roberts' full projected leaderboard for the Xfinity 500, all from the nation's premier NASCAR betting expert!