Romain Dumas Rubens Barrichello Roberto Gonzalez Richie Stanaway Robin Frijns Robert Wickens Ryan Hunter-Reay Rene Binder Richard Lietz Ricky Taylor Ryan Briscoe Richard Westbrook René Rast Ryan Dalziel Raffaele Giammaria R.C. Enerson Rahel Frey Renger van der Zande Ryan Eversley Raffaele Marciello Robin Liddell Rodrigo Sales Richard Antinucci Ryan Lewis Robert Renauer Richard Heistand Reinhold Renger Ricardo Vera Remo Ruscitti Rolf Ineichen Ricardo Perez de Lara Riccardo Agostini Ryan Cullen Ross Gunn Rik Breukers Rino Mastronardi Robby Foley Robert Alon Roman De Angelis Randy Walls Robert Masson Rui Andrade