Another discipline unusually popular with Liechtensteiners is motorsport – American-born German-Colombian Rikky von Opel raced under the flag of Liechtenstein in Formula One in 1973 and 1974, and Manfred Schurti competed in 9 editions of the 24 Hours of Le Mans as a Porsche factory driver with a best finish of 4th outright in 1976. The nation is currently represented internationally by Fabienne Wohlwend in Ferrari Challenge and Formula 3, as well as Matthias Kaiser who competes in prototype endurance racing.