The aim of this study is to examine the relationship between athletes' irrational performance beliefs and their aggression and anger behaviors. In individual and competition-focused sports, not only physical preparation but also psychological performance and irrational performance beliefs play a significant role in athletes’ success. The most notable effects of irrational beliefs on athletes' performance are observed in aggression and anger behaviors. On the other hand, rational beliefs enable athletes to adapt to competitions and control their anger and aggressive behaviors. Therefore, rational beliefs contribute to the athlete's success and help them achieve their goals. As a result, the importance of the impact of aggression and anger behaviors, which are believed to affect athletes' performance, on successful performance should be emphasized, and training programs aimed at reducing or eliminating such behaviors should be provided. The extent to which irrational beliefs influence athletes' performance should be determined, and coaches and trainers should teach athletes to set realistic goals and understand that both success and failure are part of sports, with even negative experiences contributing to the growth of both sports and athletes. Conducting studies within this framework in the literature would be more beneficial. Furthermore, aggression and anger behaviors, which are typically investigated in combat sports, should not be limited to these disciplines but examined in the context of team and individual sports as well, exploring the impact of personality traits on these behaviors. Such studies would contribute to the literature. Additionally, research evaluating the effects of various psychological traits, such as mental resilience, self-talk, self-efficacy, and anxiety, on irrational performance beliefs is also believed to enhance the literature.