By the decision of the Ministry of Science and Education from 2019, a new curriculum was introduced for the subject of PE for primary schools and gymnasiums in the Republic of Croatia. The new curriculum brings numerous novelties and benefits, among which is greater freedom in the choice of program content. Since the previous curriculum did not allow the selection and implementation of those program contents that were not part of the prescribed curriculum, thus, the selection of the tennis game and its contents, the new curriculum opens up various new options and ideas on the implementation of tennis in the curriculum of the subject P.E. The aim of this thesis is to present the possibilities of implementing tennis and tennis content in the curriculum of P.E. Due to the simplicity of the content, the necessary aids, the number of children in the classes and the age of the children, tennis content will be much easier and more practical to implement in the curriculum of primary schools (especially from 1st to 3rd grade of primary school). The reason for this is the fact that these classes have a much larger fund of hours which will greatly facilitate the implementation of more hours of tennis, and thus the implementation of a larger number of tennis contents, a larger number of repetitions of certain tennis contents and the development of better and stronger foundations of the tennis game. This paper will present various ways of adopting and improving the game of tennis that can be very easily applied in the teaching of PE.