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The “winner-take-all” and “superstars” theories are complementary in an approach that favors the concentration of income by dominant actors. The cases studied, men’s tennis and golf, highlight a greater imbalance among tennis players’ incomes. This imbalance is explained not by the prize distribution structure in the two sports’ tournaments but rather by the lower turnover for tennis compared to golf in sports rankings This reveals the existence of a specific tennis labor market, characterized by the concentration of income into a few players, which is established over several seasons.