Two seasons later, during the 1938 Gran Premio di Tripoli, László Hartmann's Maserati 4CM cut a corner in front of Farina. The cars collided and overturned. Farina survived without major injuries, but Hartmann died the following day. In 1938, the official Alfa Romeo team, Alfa Corse, returned to motor sport and Farina was a member. Driving the new Alfa Romeo 158 Voiturette in 1939, he won the Grand Prix d'Anvers, Coppa Ciano and the Prix de Berne, to become the Italian Champion for the third year in succession. The following year, he won the Tripoli Grand Prix and finished second in the Mille Miglia for the third time. After World War II, Farina returned to Alfa Corse to drive their 158. He won the 1946 Grand Prix des Nations. However, he left Alfa Corse after a disagreement over team leadership and sat out the whole of the 1947 season. He came back to the sport in 1948 with a privately entered Maserati and a works Ferrari. During this period, he also married Elsa Giaretto. In her opinion motor sport was a silly and dangerous activity, and she tried to persuade Farina to stop. Three days after their high society wedding, Farina flew to Argentina where he drove his Maserati 8CL to victory in the Gran Premio Internacional del General San Martín. On his return to Europe, he won the Grand Prix des Nations and 1948 Monaco Grand Prix. Using Ferrari's first Grand Prix car, the Ferrari 125, he won the Circuito di Garda before giving the Temporada another visit. This resulted in victory in the Copa Acción San Lorenzo in February 1949. The rest of the year he raced Maseratis for Scuderia Milano and Scuderia Ambrosiana, and at times in his own 4CLT/48. He won the Lausanne Grand Prix and then was re-signed by Alfa Corse. In 1950, Farina returned to Alfa Romeo for the inaugural FIA World Championship of Drivers. The opening race of the season was held at Silverstone Circuit, in front of 150,000 spectators. Farina won, with teammates Luigi Fagioli and Reg Parnell, completing an Alfa Romeo 1-2-3 finish. At Monaco eight days later, a multiple pile-up on the first lap saw Farina spin out of a race that Juan Manuel Fangio went on to win.