following the war, sommer quickly returned to winning ways, claiming victory in the 1946 rené le bègue cup race at saint-cloud. at the 1947 turin grand prix in valentino park he won the first ever grand prix for enzo ferrari as an independent constructor. the following season, sommer switched from the ferrari team, again for a privately owned car, this time a talbot-lago. in 1950, the formula one world championship began and sommer drove in two grand prix races for ferrari and three in a privately entered talbot-lago, retiring in all but one.