This graduation thesis aims to demonstrate the process of merging two basketball clubs- KK Cedevita and KK Olimpija into a new club and a new legal entity and to demonstrate the consequences of this procedure and its termination. The thesis is based on an analysis of an almost singular case since the fusion of sports clubs is not usual, particularly if clubs belong to different states. The first part of the thesis provides an outline of sports systems in Croatia and Slovenia as well as a parallel analysis of legal regulations controlling the field of sports clubs and their agency in the legal traffic. The second part focuses on the process of fusion and its preconditions. It further explicates how the procedure was implemented and presents legal actions that were taken and the consequences of these actions for the Croatian Basketball Association. The most important outcome of the fusion was the legal dispute between KK Cedevita and KK Cedevita Junior as the legal successor of KK Cedevita. The legal issue that led to this dispute was the question of sports-legal succession, i.e. whether sports-legal succession regarding the right to participate in the same competition rank could be transferred per the model proposed in the process of fusion. After the Croatian Basketball Association refused to accept the effects of succession, which KK Cedevita Junior regarded legally effective, the dispute was submitted to arbitration to the Council of sports arbitration of the Croatian Olympic Committee in accordance with the Sports Law, the rule book and the statute of the Association. The dispute ended with a verdict by the Council, which supported the view of the association.