Looking at the sample of 80 young male and female tennis players who classified in the Slovenian tennis ranking lists in the age categories to 14 and to 16 years old, we focused on the differences in flexibility tests among injured and uninjured players. We also compared the flexibility between sexes, the flexibility between player up to 14 years old and players up to 16 years old, the flexibility between the dominant and non-dominant side, and the relationship between the flexibility and the amount of tennis and conditioning training. Hypotheses were verified with the Mann Whitney U test. The connection between flexibility tests, the amount of conditioning and tennis training was checked using the Spearman correlation coefficient. Bilateral sides comparison was checked with the Wilcoxon test. The results showed that there are differences between players with and without a shoulder injury in dorsiflexion flexibility of the dominant and non-dominant wrist. We found a statistically significant difference between the sexes in the flexibility of abduction of the hip on a dominant side. When comparing age groups up to 14 and up to 16 years, we found that there are statistically significant differences in the flexibility of flexion of the dominant elbow and in the abduction of the non-dominant hip. Comparing the dominant and non-dominant side, we found differences in the flexibility of internal and external rotation of the shoulder and the dorsiflexion of the wrist. However, we found a low and positive correlation between the amount of conditioning training per week with the flexibility of the internal rotation of the shoulder on the dominant arm, a medium and negative correlation with the flexibility of elevation through abduction of the shoulder on the dominant arm, a low and negative correlation with the flexibility of the shoulder on the non-dominant arm and a low and negative correlation with the flexibility of flexion of the elbow on the dominant arm. The obtained results showed that the flexibility tests used did not show differences between injured and uninjured female and male players, except for shoulder injuries.
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