The contribution deals with the issues of judging the level and evolution trends of somatic and motor performance preconditions in tennis. In contemporary world tennis, there is an obvious tendency to the physically demanding game and that is why the diagnostics of the level of performance preconditions is an important part of the training process. The research intent was to perform a longitudinal observation of the level of somatic and motor preconditions in two female tennis players, who have reached a high international level of performance in their adult age, to evaluate evolution trends and to compare the found data with a population of female tennis players. The research had the character of a longitudinal study and the data were gathered using the test battery TENDIAG1 containing three somatic and six motor items. The results of both observed female players clearly show that the total point score in the test battery was above the boundary of the average level of the female tennis players’ population. The results proved that the level of somatic and motor preconditions of both female players was mostly above average. The results confirm the importance of somatic, conditioning, and coordination preconditions for tennis.