Self-efficacy has consistently distinguished between highly successful and less successful athletes. Given this relationship there is demand in sport to have strategies to enhance self-efficacy. The use of motivational general-mastery (MG-M) imagery is an effective psychological technique to enhance self-efficacy. What moderates the effectiveness of this technique is the athlete’s ability to use MG-M imagery. A single-subject multiple baseline design was employed where inter-collegiate golfers (n = 3; male) completed baseline and post-intervention measures: Motivational Imagery Ability Measure for Sport and the Golf Self-Efficacy Questionnaire. Participants completed the Competitive State Anxiety Inventory prior to each competition and the score recorded for each round of golf was used to evaluate performance. Participants engaged in six sessions of guided MG-M imagery training over a 3-week period. The results of the study demonstrated that the sport confidence and golf self-efficacy of Participants 2 and 3 improved, while Participant 1 remained at a relatively constant level. All participants showed improved imagery ability and Participants 1 and 3 demonstrated improved golf performance. Post-experimental interviews indicated all participants felt the imagery training program was effective and appropriate for their sport.