The topic of the master's thesis is „PROCEEDINGS AT THE COURT OF ARBITRATION FOR SPORT AND THE ACTION FOR SETTING ASIDE AN AWARD BEFORE THE SWISS FEDERAL SUPREME COURT“. The paper consists of seven main chapters: 1. Introduction, 2. Historical Overview of the CAS, 3. Arbitration Agreement, 4. Ordinary Arbitration Division, 5. Appeals Arbitration Division, 6. Action for setting aside an award before the Swiss Federal Supreme Court and 7. Conclusion. In the introductory chapter, I presented the environment in which the CAS was needed as a unifying solution because disputes in sports were previously resolved in completely different ways, leading to legal uncertainty. The next chapter generally covers the first 10 years of CAS operations and its composition at that time. The Gundel case is also discussed, which was a turning point in the work of CAS and completely changed its structure by introducing ICAS, which helped ensure independence. The third chapter deals with the arbitration agreement and arbitration in general. The arbitration agreement is defined according to the New York Convention, and the requirements for the validity of the arbitration agreement under Swiss law are also discussed. The chapter on the ordinary arbitration division focuses on the procedure before that division. It also details the CAS Code and its provisions relevant to the procedure. Additionally, these provisions are compared with Swiss legislation. The following chapter also addresses the procedure, but the appeals procedure, and discusses the specifics of that process. The sixth chapter delves into the institute of the Action for setting aside an award before the Swiss Federal Supreme Court as provided for in Swiss legislation and the grounds for appeal. Swiss Federal Supreme Court judgments are cited as examples. In the conclusion, I provide my opinion on the journey of the CAS as an institution from a distrusted and, for some, impartial tribunal to a true arbitral court.