In recent years, there has been some dispute over the appropriate way to model decision making in professional sports leagues. In particular, Szymanski and Kesenne (2004) argue that formulating the decision-making problem in a noncooperative game leads to radically different conclusions about the nature of competition in sports leagues. The author describes a simulation model that can be used in a classroom to demonstrate how competition works in a noncooperative context. More generally, in simulation exercises, students typically gravitate quickly toward the Nash equilibrium, making this a simple and powerful way to introduce them to the concept. The supporting Excel spreadsheet used to conduct the game can be downloaded from the author's personal Web page, http://www.cass.city.ac.uk/faculty/s.szymanski/sports-league-simulation-blank.xls. (Contains 7 tables, 1 figure, and 13 notes.)