Purpose: The classic observation of the differences in the anthropological characteristics of children by sex. involved in sports, is often caused by erroneous treatment. That is why the purpose of this work is to establish similarities and differences in the anthropological characteristics of young boys and girlstennis players. Methods: From the data bank of testing, a group of 48 girls and 40 boys was drawn. In the anthropometric area 39 were measured, from which: BMI. percentage of fat mass and somatotype were calculated. Motorical abilities were measured using 19 tests. Endurance was measured using a Multistage fitness test (Beep), following a heart using rate monitor (Polar) and blood lactate concentrations was measured after maximal effort. For the analysis of psychological factors, three tests were conducted: general achievement motivation (Havelka & Lazarevic, 1980). sports achievement motivation (Havelka & Lazarevic. 1984) and Eysenck`s EPO-J. Data processing, descriptive statistics as well as variance analysis were performed using statistical statistics package Statistica 13 (TIBCO Software Inc. (2017). Statistica (data analysis software system), version 13. http://statistica.io.). Results: The obtained data shows a very small and expected difference in anthropometric space. The statistically significant difference is present in the percentage of body fat (p <.00). which presents the girls having a higher body fat mass. The same does not confirm the projection on the endomorphic component of somatotype (p = .17). In motorical abilities, the biggest difference is measured in the tests of flexibility (p <.00), which presents the girls as young athletes with a significantly higher degree of flexibility. The girls are presented statistically significantly more successful in the circulatory test (p = .01) and they also achieve a significantly higher concentration of lactate in the blood after the Beep test. Boys are statistically significantly more successful in performing agility tests (p = .04) and show higher aerobic power than girls (p = .04). The research did not confirm any significant difference in personality traits as well as in the area of motivation. Only the boys were projected statistically significantly more strongly on the scale of positive emotional responses in general achievement (p = .04). while the girls were projected statistically significantly higher on Lie scale (p <.00). Conclusion: The research carried out has confirmed some previous insights into the differences between the sexes. Unlike much of the research done so far, the differences in personality traits have not been confirmed, especially in the projection of the extroversion. In a detailed analysis of the data obtained, special attention should be focused on the knowledge that girls in this chronological age can be biologically more mature for up to two years.
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