The aim of this thesis is to clear and to band effect and importance of endurance also known as functional abilities which has affect on performance and succes in tennis game. Tennis is a polystructural acyclic sport activity and speed, coordination and endurance are the most important abilities for success in tennis. Also, the adaptation on different conditions of playing is important because of playing on different surfaces. Different surfaces affect on duration of point and because of this seek different types of preparation and endurance, also tennis sufaces have affect on different type of endurance. The purpose of this thesis is to exemine and identify which are the dominant energy processes in tennis and what is the correct way to develop and maintain it. Tennis game consists of intervals of game and pauses and that will be also purpose of analyzing. Also, there is a large number of different running directions such as lateral and frontal sprints. All motions have to be in synergy with technical and tactical skills which success is based on endurance. Dominant energy system in tennis is anaerobic alactic. 95 % of points last less than 15 seconds. Tennis game consists of high intensity intervals of game which are followed by intervals of rest. The purpose of rest intervals is recovery what is possible if player has certain level of aerobic abilities. In this thesis are presented exercises to improve specific endurance in tennis on court and off court. The purpose of this graduation thesis is to present the importance of specific endurance and give practical exercises which are useful in practice.