There have been 32 Formula One drivers who have represented Brazil, including three world champions. Ayrton Senna, the three-time title winner, is regarded by many as the best driver in the history of Formula One. Nelson Piquet also won the title three times and Emerson Fittipaldi was a two-time winner. Rubens Barrichello, who used to hold the record for the most races contested with 322 starts, finished as the championship runner-up in two seasons. Following the retirement of Felipe Massa after the 2017 season, in 2018 there were no Brazilian drivers entered for the World Championship, the first time this had occurred since 1969.