Walker acknowledges how challenging it is to determine which teams in history truly deserve to be called the greatest. Rather than accepting existing rankings—which the author discovered were often plagued by selection bias, regional favoritism, and statistical inadequacies—Walker embarked on an ambitious empirical project to identify history’s most dominant teams across all major sports worldwide.

Walker’s methodology reveals both the rigor of modern sports analytics and its inherent limitations. His systematic approach involved establishing clear criteria for what constitutes a team (at least five members who interact directly with opponents and each other), eliminating teams that lacked sufficient opportunity to prove themselves against top competition, and requiring sustained excellence over at least four seasons to minimize the influence of luck. 

Walker used the Elo rating system—originally developed for chess and adapted for sports—as his primary evaluative tool. The Elo method is a mathematical method that assigns teams a running score based on their wins and losses but adjusts these points based on the quality of their opponents and the importance of each match. For example, beating a top-ranked team in a championship final earns far more points than defeating a weak team in a friendly exhibition game. Walker’s decision to use the Elo method reflects the growing sophistication of sports analytics. Yet his acknowledgment that no single metric could capture true greatness suggests an understanding that sporting excellence transcends mere numbers. This tension between quantitative analysis and qualitative judgment runs throughout the chapter, reflecting ongoing debates in sports management about the limits of data-driven decision-making.

The resulting list of 16 “Tier One” teams spans from 1927 to 2015 and crosses multiple continents and sports. Walker’s inclusion of teams like the Collingwood Magpies (Australian Rules Football) and France’s handball team alongside more familiar dynasties like the Boston Celtics and New York Yankees demonstrates an attempt to overcome the cultural myopia that often characterizes sports discourse. This global perspective is particularly relevant in an era of increasing international sports viewership and cross-cultural athletic exchange.

The chapter’s most controversial aspect may be its exclusions rather than its inclusions. Walker’s dismissal of celebrated teams like Michael Jordan’s Chicago Bulls and Tom Brady’s New England Patriots will likely provoke debate, particularly given these teams’ cultural significance and commercial impact. His strict methodological criteria, while defensible from an analytical standpoint, may overlook important factors like a team’s influence on their sport’s evolution or their ability to perform in high-pressure moments beyond what statistics capture.

Chapter Lessons

• Many celebrated teams fail to meet objective criteria for sustained excellence, while lesser-known teams from non-mainstream sports deserve recognition.
• True sporting dominance requires both opportunity and achievement; teams cannot be considered among the greatest if they never faced top competition or if circumstances prevented them from proving themselves.
• Sustained excellence matters more than brief brilliance, as true greatness lies in the ability to maintain high performance over time.
• Patterns of success in excellence transcend cultural and sporting boundaries.

Reflection Questions

• Walker excluded several beloved teams from his final list based on strict criteria about sustained excellence and competitive opportunity. Can you think of a team or group whose reputation exceeds their actual achievements? What factors contribute to this gap between perception and reality?
• The author minimizes the role of luck by requiring teams to excel for at least four seasons. How do you distinguish between luck and skill in your own successes and failures, and might you be over- or under-attributing outcomes to either factor?