摘要：The aim of the study was to investigate the relationship between indicators of functional capacities and the competitive successfulness of tennis players in the age category from 12 to 14 years. The sample of examinees consisted of 34 male and 22 female players from 12.3 to 14.9 years of age, competing in the age category from 12 to 14 years, that are ranked on the rank list of the Croatian tennis association. The relationship between measured parameters and competitive successfulness was established by the Pearson's correlation coefficient, and the predictive value of the parameters for estimating competitive successfulness by means of the regression analysis. The results showed a moderate, but statistically significant correlation between aerobic capacity parameters and competitive successfulness in boys and girls in the 12 to 14 age category (p<.05). In boys, there were also moderate, but statistically significant correlations between age, anaerobic capacity and competitive successfulness (p<.05).
