Objective of this study was to obtain knowledge on coordination determinants of technical skills of female tennis players aged 9 and 11. Materials and methods. The study included female tennis players (n= 60), body height (9 yrs ± 6.1 -137± 5.7 cm; 6; 11 yrs±7.2 -148± 5.2 cm), body mass (9 yrs - 34± 1.9 kg; 11 yrs - 43± 2.3 kg). To assess the female tennis players' technical skills the test of 100 balls was applied. To control coordination motor abilities, the following tests were used: certain EUROFIT tests (the flamingo test, tapping the discs), the Spalding slalom running test, the shuttle run test, the Spider test, jumps over a skipping rope, jumps in the hexagon, the Starosta test, the eye-hand test, the test of simple reaction and the test of complex reaction. Results. It was discovered that in the group of 9-year-old female tennis players, the simple reaction test result demonstrates the best predictive properties (it accounts for 19% of the variance in the test of 100 balls). In the group of 11-year-old female tennis players, the result of the shuttle run test independently accounts for 38% of the variance of the dependent variable. Conclusion. The effectiveness of performing the test of 100 balls depends on different predictors of coordination motor abilities.
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