This study compared the motor skill effects of a peer teaching format by means of task cards with a teacher-centered format. Tennis performance of eighth grade students (n = 55) was measured before and after a four week intervention period in a regular physical education program. Results show that peer mediated learning with task cards accomplishes motor goals almost as well as a teacher-centered format in a technical sport like tennis. In addition, it is discussed that peer mediated learning settings with task cards could offer a powerful learning environment, emphasizing social as well as motor goals in physical education. (Contains 5 tables and 3 figures.)