This bachelor thesis focuses on the central characteristics of sports marketing, specifically sports sponsoring in professional sports. It defines the elements of marketing, particularly in sports, and examines Adidas' sports marketing of tennis. The paper also differentiates between "marketing of sports" and "marketing in sports." As examples, the thesis analyzes Adidas' sponsoring of athletes like Federer and Woods, teams like Bayern Munich and Borussia Dortmund, and sports events like the 2012 Olympics and US Open. The result demonstrates how marketing has increased the business of sports and made sponsoring professional sports more important for companies.