Considered the most prestigious professional auto racing event in Colombia, Popow has also enjoyed success in the Bogota 6 Hours.

Popow made his Grand-Am debut in 2011, racing in the Rolex Sports Car Series for Starworks Motorsport team.

In 2012, Popow took his first victory in the inaugural Brickyard Grand Prix Indianapolis Motor Speedway, and obtained two second places and two fourth, so that finished sixth in the drivers' championship.

In 2013 Popow won the ‘Jim Trueman’ Award by a landslide and the Starworks Motosport was crowned ‘Sports Car Team of the Year’ by the SPEED Channel.

Popow won the 2012 12 Hours of Sebring in his American Le Mans Series debut, teaming with Burt Frisselle and E. J. Viso in a CORE autosport Oreca FLM09 Prototype Challenge car.

In August 2012, Popow made his NASCAR debut, driving in the Nationwide Series for TriStar Motorsports at Watkins Glen International.