By Tom Bowles Here’s a rundown of the best and worst races of the 2021 NASCAR Cup Series season. Across 36 races, the 2021 NASCAR Cup Series provided more than its fair share of fantastic finishes, although there was more than one dud as well. Here’s a rundown of the three best and three worst races from the 2021 season. 3 Best NASCAR Races of 2021Bass Pro Shops Night Race (Bristol)Before Chase Elliott and Kevin Harvick went at it, this race had it all. Its 23 lead changes were the most for any short track last season, and the Round of 12 cutoff race served up drama from start to finish. Up fr…