Objective study this is for analyze effect of KEMP VINCENT Training on consistency groundstrokes in athletes tennis. Janis research use method experiment. Method study validating with test influence One or more variable than other variables. Study implemented in the field Yogyakarta State University Tennis. Implementation of 16 meetings, with frequency of 4 meetings in One Sunday. Taking sample using purposive sampling. Criteria sample includes; [1]. Players who are still active follow practice [2]. Willing follow all over training given [3]. No in circumstances Sick. Amount population of 20 athletes tennis field selalabora. Instruments / tests use forehand groundstroke test and backhand groundstroke test. The results of the validity and reliability of the backhand groundstroke are 0.895 and 0.925. Value data normality test results significance 5% or 0.05 normally distributed data. Homogeneity test obtained mark significance of 0.694 and 0.617 ≥ 0.05, population own similarity variant or homogeneous. And percentages increase in ability consistency with hasi; 18.3%. So that method Kemp Vincet Rally Tennis training matches for enhancement consistency groundstrokes, there are average increase of the player 's forehand groundstroke and backhand groundstroke scores tennis field selalabora.