During the years before World War II, Rapid was one of the most successful clubs in Europe. Before the Second World War, Rapid won the Viennese championship 16 times. In these years there was no nationwide championship because professional football teams only played in Vienna. In 1930 Rapid won the Mitropacup against Sparta Praha (2:0; 3:2) ("La Coupe de l'Europe Centrale"), one of the first international competitions in Europe. Around this time, the rivalry with the other great club of Vienna, FK Austria, started and continues today. Rapid was the club of the working class, while supporters of FK Austria were more middle class.