 Complete the following phrase:  After his single seater career Thompson moved into the IMSA GT3 Cup Challenge for 2013. In a privately funded team, the driver scored two podium finishes. For 2014 Thompson signed with Kelly-Moss Motorsports. Winning three races two at Watkins Glen and one at Road Atlanta, Thompson won the championship. Thompson made a guest appearance in the Porsche Supercup. At Circuit of the Americas, supporting the 