#4 Jim Clark (Lotus-Climax, 1965 season, 5 wins)
The greatest year for one of the greatest talents in Formula one, Jim Clark won five races on the trot en route the title. His winning streak started from Belgium GP till the German GP. He also won the season opener at Prince George, South Africa. Jim also won the Indianapolis 500 that year.
Till date, he is the only driver to win Indy and F1 titles in the same season.