 Instead, IMSA's Continental Tire SportsCar Challenge and USAC's Pirelli World Challenge adopted TCR regulations as part of their packages.17 January 2017 confirmed that the TCR will be the main class in the new racing series TC Open from the organizers of GT Open and Euroformula Open.1 June 2017 confirmed that GT Sport postpones the TC Open for a certain period due to low number of entries.