The aim of this study is to determine the dynamics of changes in motor skills in volleyball players of younger age categories over a period of 18 months. The testing of motor skills at three time points of measurement during the training process was conducted on a sample of 9 youth volleyball players, members of the youth team at the Volleyball club Zadar, categorized according to situational and competitive efficacy into successful (n=5) and less successful (n=4). The average chronological age of subjects at the first point of measurement was 13.89±0.68 years, whereas at the final, third measurement point, the average age was 15.18±0.81 years. The subjects’ average body height at the first point of measurement was 181.00±0.06 cm, and average body mass was 60.67±5.58 kg, whereas at the third point of measurement their average height was 185.00±0.05 cm, and body mass was 67.05±4.88 kg. The battery of tests used to assess motor skills included 5 tests for assessing non-specific, i.e., basic motor skills and 2 tests for assessing specific motor skills. To assess non-specific agility and explosive power, the following tests were applied: side steps, 9-3-6-3-9, standing long jump, supine medicine ball throw, and 20-m sprint. To assess specific jumping ability and explosive power, the following tests were applied: vertical jump and spike approach volleyball jump. The obtained results indicate the positive dynamics of the development of motor skills in both successful and less successful youth volleyball players. Nonparametric Friedman’s ANOVA yielded a significant difference between the three time points of measurement of motor skills of explosive power of arms and legs, and specific and non-specific agility in more successful volleyball players during the 18-month training process. Less successful volleyball players showed no significant progress in vertical jump explosive leg power. In future research, the number of subjects should be increased and youth players who are members of national selections should be included.