The NASCAR Cup Series playoff race is heating up after Michigan and before Mexico City; see where drivers closest to the bubble stand.

Mexico's Autódromo Hermanos Rodríguez is about 7,500 feet above sea level and the thinner air will impact engines.

Thousands of race car enthusiasts hit the stands Sunday afternoon for the last day of the NASCAR Cup Series at Michigan International Speedway. 200 Laps around a 2-mile track, brightly colored cars speeding at 180mph,