The basic personality traits and motivational dimensions are important determinants of consistency or stability of performance and sport achievements in interactive sports. A review of previous research shows the lack of examinations of the differences in basic personality traits and motivational dimensions between players in basketball junior and senior age groups, and between players in different positions in the game. Also, research on the relationships between personality traits and motivational dimensions of basketball players are unjustifiably neglected. In this research we used the five-factor model, as well as theories of achievement motivation (need achievement theory and achievement goal theory). There are three goals of this research: to assess the measurement properties of the applied inventories, to establish whether the players differ in personality traits and motivational dimensions with respect to age and position in the game and examine whether there is a correlation between personality traits and motivational dimensions on the sample of basketball players. The study included 168 players (88 junior and 80 senior age) and were administered the following questionnaires: Big Five Inventory - BFI (Benet-Martinez and John, 1998), Sports attitudes Inventory - SAI (Willis, 1982), Task and ego orientation in sport questionnaire TEOSQ (Duda, 1989). Evaluation of the applied measured instruments showed that measures were acceptable or good with regard to reliability and validity. The results obtained in the tests of differences not fully confirmed the expected differences in the reached level of traits and motivational dimensions with respect to the position in the game and with respect to age groups. Research findings show that outside players in basketball have higher levels of Conscientiousness traits than inside players. Senior players, in relation to junior, are characterized by a lower level of Neuroticism, ie. higher Emotional stability. Also, with the trait Neuroticism, there is a significant interaction between age and position in the basketball game. In the motivational dimension domain obtained results suggest that outside players in relation to the inside show higher degree of expression of motives to achieve success and motives to achieve dominance. Also, with the motive to achieve dominance, there is a significant interaction between age and position in the game. Findings show that junior age players, in relation to the senior, have more expressed outcome goal orientation or competition goal orientation. Results of correlation analysis in the personality traits domain confirmed that Extraversion is in a moderate positive correlation with the traits of Conscientiousness and Openness, whereas the correlation between personality trait Neuroticism and Agreeableness and Conscientiousness is negative. Also, traits Conscientiousness is moderately positively correlated with traits Agreeableness and Openness. In the motivational dimension domain, it was found that there is a positive correlation between motive to achieve success and task goal orientation or mastery goal orientation. Also, moderate positive correlation between motive to achieve dominance and motive to achieve success and task goal orientation was obtained. Results of correlation analysis show that there is a moderate positive correlation between motive to achieve success and motive to achieve dominance with traits of Extraversion, Conscientiousness and Openness. Likewise, the moderate positive correlation between motive to avoid failure and trait Neuroticism was obtained. Also, task goal orientation is in the medium positively correlated with trait Conscientiousness. Canonical correlation analysis resulted in two pairs of canonical factors. First pair of canonical factors in the domain of personality traits mostly determine variables Conscientiousness and Extraversion, and to a lesser extent, Openness as well as motivational dimensions: motive to achieve dominance, the motive to achieve success and task goal orientation suggesting a predisposition for the approaching behavior. Second pair of canonical factors in the personality trait domain is primarily determined by variable Neuroticism and to a lesser extent by variables Agreeableness and Conscientiousness (on the negative pole) as well as by motive to avoid failure and by outcome goal orientation implying predisposition for avoiding behavior. Inclusive, recommendations derived from the implications of the research may be applicable in the forming of the selection of players, as well as in the management of the integral sport preparation process which is focused on increasing the level of actual quality of basketball players. Finally, the paper describes the limitations and future directions for research.