 In comparison, football in Serbia was introduced a bit latter, mostly brought by students coming from Austro-Hungarian urban centers like Vienna, Budapest, Prague or Zagreb where football was already developed as sport.Despite that fact, the period was marked by the immediate appearance of a growing rivalry between Croatian and Serbian clubs as soon as the championship on national level begin in 1923.Although initially on continental level the Yugoslav clubs had been generally inferior in their clashes against stronger Central European clubs in the Mitropa Cup, usually being eliminated in the first rounds, by the late 1930s Građanski and BSK managed to make better performances reaching intermediate stages of the competition.