[1] Lefterov began his sporting career at 9 years as a kart pilot at the “Bulauto Racing” Automobile Sports Club in the “Mini BG” class.

For the following eight years, he won 9 titles, including six Republican, two European and one World, in various classes.

At the age of 16 he won the Bulgarian Republican Men’s Championship, Class KZ2.

In 2015 he joins GT4 European Series with Bulavto Racing team in Lotus Evora as the youngest ever driver in the series.

Lefterov finished on his class podium in his first ever car race.