Vintage Brad Keselowski NASCAR T-Shirt. Brad Keselowski, an American stock car racer, team owner, and entrepreneur, is a full-time competitor in the NASCAR Cup Series, driving the No. 6 Ford Mustang for RFK Racing. He also co-owns the team. As an owner of Brad Keselowski Racing, he fielded two full-time trucks in NASCAR's Camping World Truck Series. Keselowski, who began his NASCAR career in 2004, is one of the few drivers to have won a championship in both the Cup Series and the Xfinity Series, making him the 25th driver to have won a race in NASCAR's three national series.