Singer Taylor Swift performs during the F1 United States Grand Prix at Circuit of The Americas in Austin on Saturday. Pic/AFP

American singer Taylor Swift enthralled close to 80,000 screaming fans at the Circuit of the Americas on Saturday with her famous hits ahead of Formula One’s Austin Grand Prix. The 26-year-old drew a mix of fans — young and old, who came solely to see her. Swift acknowledged the huge crowd that danced and sang throughout her set, which ran to 90 minutes.