Controversies
In early 1931 he was accused of turning professional (meaning he broke the rule of amateurism) and had to skip a couple of month before being acquitted when it turned out that the he was mistaken for another person named Danel Prenn Several month later the German Tennis Union suspended him for another six month for sponsorship charges based on the accusations of racquet manufacturer Hammer & Co. who claimed Prenn asked for payment for choosing Hammer's equipment. Local media labelled this action as anti-semitic and it being forged by Hammer Company. As a result of his suspension Prenn's titles were taken back as well as his amateur license. He was also expelled from the Germany Davis Cup team although it didn't affected his presence as Germany was eliminated in the first round of the 1931 International Lawn Tennis Challenge
In April 24, 1933 a newly appointed reichssportführer issued a declaration on the behalf of the German Tennis Lawn Association stating that no Jew could be selected in the national team or Davis Cup and that no club or associations or Jewish Marxists could not be affiliated to the German Tennis Federation and personally the Jewish player named Dr. Prenn would not be selected in the Davis Cup team in 1933. The Swedish king, Gustav V, a keen tennis player, dined with the german top brass in the summer of 1933, criticizing new racial policies. After the lunch, the elderly king played a game with Prenn. Shortly thereafter Prenn moved to Great Britain.
German baron Gottfried von Cramm protested against the treatment of Prenn and as a result was targeted and arrested on charges of homosexuality and imprisoned.
Read more about this topic: Daniel Prenn