[1] Froitzheim was engaged to Leni Riefenstahl, whom he had met in 1921, for some years and also had a love affair with Pola Negri in the 1920s.

Another of his greatest victories was the title at the inaugural World Hard Court Championships on clay in the Paris suburb of Saint-Cloud in 1912, beating his compatriot Oscar Kreuzer in the final in four sets.

In 1914, he advanced to the All-Comers final at the Wimbledon Championships, losing to Australian Norman Brookes in five sets.

[3] At the end of July 1914, he and Oskar Kreuzer played the semifinal of the International Lawn Tennis Challenge at Pittsburgh against Australasia.

When World War I broke out, the president of the local tennis club kept this from Froitzheim and Kreuzer as he didn't want to disrupt the match.

While Kreuzer stayed at a camp near Leeds, officer Froitzheim was kept at Donnington Hall until the end of the war in 1918.