The NASCAR Cup Series regular season is nearing its end, and the pressure is at an all-time high as the tour heads to Iowa Speedway for the Iowa Corn 350 today at 3:30 p.m. ET on USA Network. With only four races remaining, the battle for the Regular Season Championship is tighter than it's been in years, with just 20 points separating the top four drivers. The playoff bubble is also a hot topic, as history has shown that no one without a win is safe in the final stretch.