This study presents the case of Steve, an adolescent competitive springboard diver. This diver, referred by his coach, received the Mindfulness-Acceptance-Commitment (MAC) approach for performance enhancement. The MAC protocol, originally written for an adult population, was used in modified form (under consultation from the authors) to ensure appropriateness for an adolescent population. Conducted in nine individual sessions, the intervention targeted abilities in attention and value-driven behavior to enhance focus, poise, and overall diving performance. Self-report measures of mindfulness and flow, along with objective measures of diving performance were collected pre- and postintervention. Results indicated increases in mindful awareness, mindful attention, experiential acceptance, flow, and diving performance from pre- to postintervention. This case supports the applicability of the MAC protocol with an adolescent athlete population.