High Quality Content by WIKIPEDIA articles! 1927 was the first year in which the Prva Liga used an actual league system, with Hajduk Split being the first national league champion. Newcomer BSK Beograd replaced Jugoslavija Beograd as Serbia`s top-performing club, this was due to half of the Jugoslavija players switching clubs to play for BSK. Hajduk and second-place club BSK entered the 1927 Mitropa Cup.