Scottish driver Dario Franquitti attends the first free practice of the Sao Paulo Indy 300 race, the fourth stage of the 2013 IndyCar Series, at the Anhembi Circuit in northern Sao Paulo, Brazil, on May 4, 2013. (Xinhua/Rahel Patrasso)

Colombian driver Sebastian Saavedra attends the first free practice of the Sao Paulo Indy 300 race, the fourth stage of the 2013 IndyCar Series, at the Anhembi Circuit in northern Sao Paulo, Brazil, on May 4, 2013. (Xinhua/Rahel Patrasso)

Spanish driver Oriol Servia attends the first free practice of the Sao Paulo Indy 300 race, the fourth stage of the 2013 IndyCar Series, at the Anhembi Circuit in northern Sao Paulo, Brazil, on May 4, 2013. (Xinhua/Rahel Patrasso)

U.S. driver Ryan Hunter-Reay (Front) attends the first free practice of the Sao Paulo Indy 300 race, the fourth stage of the 2013 IndyCar Series, at the Anhembi Circuit in northern Sao Paulo, Brazil, on May 4, 2013. (Xinhua/Rahel Patrasso)

U.S. driver Ryan Hunter-Reay (C) attends the first free practice of the Sao Paulo Indy 300 race, the fourth stage of the 2013 IndyCar Series, at the Anhembi Circuit in northern Sao Paulo, Brazil, on May 4, 2013. (Xinhua/Rahel Patrasso)