A single-subject multiple baseline design across five players was used to assess the effectiveness of public posting in reducing inappropriate on-court behaviors (e.g., verbal abuse by a player during a match). Players were observed throughout the season during weekly challenge matches. The first intervention phase involved initial feedback on inappropriate behaviors and an explanation of the intervention procedures and goal setting. In the second phase, the number of inappropriate behaviors for each player was posted. Results indicated that intervention was effective in immediately reducing the number of inappropriate on-court behaviors for all players. Social validation questionnaires given to players and coaches revealed that the goals, procedures, and outcomes of the intervention were very acceptable.