The purpose of this study was to explore the self-efficacy beliefs of male professional golfers (N = 12). Three themes emerged from the qualitative analysis of interview responses. First, enactive mastery experiences were the most powerful source of self-efficacy. Second, golfers maintained high self-efficacy over time by recalling prior success, strategically framing experiences, and enlisting supportive verbal persuasions from themselves and from others. Finally, self-efficacy influenced professional golfers’ thought patterns, outcome expectations, and emotional states. Findings support and refine the theoretical tenets of Bandura’s social cognitive theory.