Day is the first Israeli driver to compete in an IndyCar-sanctioned series. He is also the first Israeli to compete in one of NASCAR's top three touring series. He currently competes part-time in the Xfinity Series, driving the No. 40 and No. 13 Dodge Challengers for MBM Motorsports.

Day was born and grew up in Ashdod, Israel, and currently lives in Tel Aviv, Israel, and is Jewish. His father, Avi Day, owns a geological-engineering company involved in mineral drilling, and his mother Maggi originally immigrated to Israel from France. He began his racing career with go-karts at the age of 10. For his bar mitzvah, his father gave him as a present a karting vehicle that cost NIS 20,000.

After high school, he performed three years of military service in the Israel Defense Forces (IDF). He was recognized by the IDF as an outstanding sportsman, the only Israeli in a Formula sport to be accorded that status. He was accepted into the Israeli Air Force pilots' training course, but gave it up because of his career. If he were not a racing car driver, he would want to be a fighter pilot.

Day won the Asian Formula Renault Challenge championship in 2009, when he was 17 years old. He then drove in the German Formula Three Championship in 2010, racing with the Performance Racing team. He finished ninth in points with a best finish of fourth (twice).

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Wikipedia