The aim of this research was to examine the relationship between mindfulness as a state, some aspects of metacognition and anxiety in sports performance in athletes. The goal was to examine whether there will be a lower level of anxiety during sports performance measured immediately after the sports performance in individuals with higher levels of mindfulness and less developed metacognition. In addition, the possibility of predicting a dimension of sport anxiety called concentration disruption was examined based on predictors of metacognition and on the dimension of mindfulness; acceptance of the mind. 75 athletes who compete in official senior leagues in Croatia in team sports of basketball, football, handball and volleyball participated in the research, of which 42 were male and 33 were female. Participants were aged between 17 and 40 (M= 21.87, SD= 3.96). To examine the aforementioned constructs, the participants completed the State Mindfulness Scale for Physical Activity (SMS-PA), Metacognition Questionnaire- 30 (MCQ- 30) and the Sport Anxiety Scale- 2 (SAS- 2). The results did not indicate the existence of a connection between mindfulness and the constructs of metacognition and sports anxiety. However, statistically significant correlations were found in some dimensions of these questionnaires, such as the negative correlation of acceptance of the mind in mindfulness and the concentration disruption dimension in sports anxiety. Likewise, it was established that the dimension of metacognition, cognitive self-awareness, positively correlated with certain dimensions of focused awareness, that is, with the mind observation dimension and the body observation dimension. Furthermore, as expected, a statistically significant positive correlation between metacognition and sports anxiety was found. Finally, metacognition significantly predicted concentration disruption to a greater extent, while acceptance of the mind predicts concentration disruption to a lesser extent. The results of this research indicated that approaches based on metacognition and mindfulness can be useful in treating sports anxiety.