Title: The reasons of the early career termination of professional tennis players Objectives: The objective of this bachelor's thesis is to ascertain and analyse reasons of, career termination of tennis players, who had assumptions to make a mark into professional tennis section and tried it for a while. Method: In this bachelor's thesis was used a qualitative type of research. The case study of four tennis players was chosen. We used the method of structured interview with opened questions, participant observation and analysis of documents. Results: The resulting ascertainment of this thesis is, that there are more reasons of career termination by professional tennis players. We found the main reasons of the career termination, are problem...