Background A player's fitness can be a key factor that may make the difference between victory and failure. Because technical and tactical skills are predominant factors in tennis it is of great importance to organize the fitness training as efficient and time saving as possible. The German Tennis Federation (DTB) has established a biannual nationwide physical testing including ∼ 400 squad players. The results obtained are used for basic talent identification as well as the development of training guidelines, including individualized training programs. The present article shows the concept for fitness testing and training design of the DTB. Two sample player profiles are presented to show the usefulness of the testing protocols and the individual conclusions obtained in order to design individualized training programs. Material and Methods Between the years 2009 and 2013, the sample of the 1052 best male and female junior players in Germany was evaluated using a battery of standard anthropometric and physical performance tests. Players were recruited from their respective regional federations and all the athletes were tested twice a year in a three week period. Results The individualized training programs are based on established percentiles considering sex, chronological age and the stage of maturation. Results show individual profiles of two players, including the percentile rank relative to their peers and related to both, their chronological and biological age. Conclusions The results enable the identification of weaknesses in different parameters and allow to design efficient physical training programs. Regarding the limited training time and the great amount of time needed to improve tennis specific skills this approach enables a more efficient way to design physical training programs.