Achieving peak performance is strongly connected to athletic flow experiences, and it is also considered one of the main goals in professional sports. For this reason, it essential to systematically examine any contributing factor connected to athletes’ flow proneness. This study examined the assumed connection between flow proneness, achievement motivation, and locus of control among dual-career athletes. Furthermore, the universality of sport flow experiences was also tested. We used Oláh’s (2005) Flow Questionnaire, Rotter’s (1966) Internal-External Locus of Control Scale, and the Achievement Motivation Test developed by Lang and Fries (2006). The test was shared online by the snowball method, and the sample consisted of 178 dual career athletes. According to the results, there is a significant connection between flow proneness, achievement motivation, and locus of control. The universality of flow was also proven.