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This thesis investigates how clinical perspectives grounded in Acceptance and Commitment Therapy (ACT) can shed light upon sport psychological issues on an individual level and how these issues may be addressed to enhance the performance of elite athletes. In the thesis it is asked 1) what Acceptance and Commitment Therapy is, and what scientific theoretical philosophies it assumes, 2) which psychological issues are particularly relevant to negatively impact individual sports performances, and 3) what aspects and methods of Acceptance and Commitment Therapy are particularly relevant for a performance-oriented practice in individual sport psychological work. The thesis uses a qualitative approach consisting of three case studies of elite athletes from martial arts, cycling and dressage riding. These case studies are presented as case examples with the purpose of illuminating and exemplifying hypotheses, assumptions and postulations presented throughout the thesis. ACT is a practice-oriented theoretical framework based on functional contextualism which seeks to promote psychological flexibility within the client. It is a psychology of the normal rather than of syndromes. ACT takes a pragmatic and ideographic approach and is characterized by using whatever methods that works best as well as being flexible in the development, selection, and adaption of therapeutic methods for the individual client. Through the case examples a sample of psychological issues are highlighted. These involve giving up, sports related anxiety, fixating on negative aspects of the athlete’s own performance, and intense nervousness. The focal point of therapeutic methods in relation to ACT in the thesis is the six therapeutic core processes of ACT. These consist of acceptance, cognitive defusion, self-as-context, present moment, commitment, and values. Through these processes it is assumed that psychological flexibility of the athletes is promoted. It is found that the concept of the six therape