Speed and agility are without question very important abilities for successful tennis playing, but since tennis is an extremely complex sport it is unclear if the results of the agility tests can predict future competitive success of young tennis players. The purpose of this research has been to compare different basic and tennis-specific speed and agility tests to determine can they discriminate young tennis players with regard to their competitive success. Thirty-five young tennis players participated in this research, (18 boys and 17 girls 11,01 ± 1,17 years) having at the moment of testing at least three years of playing experience and being regularly involved in tennis training for at least four times per week. Determining discriminative validity of the used basic and specific agility tests in relation to the young tennis players competitive success has shown that results scored on these tests can discriminate young tennis players compared to their competitive success. Even at the items where the differences between the results scored on the agility tests and competitive success classification of the players were not found to be statistically significant, numeric values of the results obtained from the agility tests show that players who were classified as more quality players also obtained a better scores/results on the agility tests, no matter if the tests were general or tennis specific ones. From the above stated, it can be concluded that the results scored on the agility tests can be one of the predictors of competitive success of young tennis players.