Chapter 1. The roots of rivalry: elements and core characteristics of sport rivalry -- Chapter 2. Rivalry influences on fan engagement within Twitter: a case study of Manchester United -- Chapter 3. Out-group treatment in higher education: using rivalry to allow student comparison of in-group and out-group members in NCAA competition divisions -- Chapter 4. Self-conscious emotions and fans -- Chapter 5. From rivalry to antipathy amid sports enthusiasts in individual sports: a case of the Seles-Graf rivalry -- Chapter 6. Toward a typology of rivalry -- Chapter 7. Who is your GOAT?: investigating fans' affective dispositions the case of motogp motorcycling -- Chapter 8. Attitudes toward rival teams' naming-rights sponsors: the influence of perceived strength of rivalry -- Chapter 9. Rivalry in and out of sport: an essay on how sport rivalry can teach people about group behavior and group member relations -- Chapter 10. Sport rivalry is more than just "the game": where we are and where we can go.