This paper describes our work on visualizing the information of a tennis match. We use competition trees to organize the information of a tennis match and visualize the competition trees by the top-nesting layered maps with translucent colored layers. We create iconic representations to describe the detailed information of athletic events in an intuitive manner. Specialized views of the information are displayed by applying multiple Magic Lens filters on the top-nesting layered maps. The dynamic nature of the tennis match is depicted by the time-varying display. The approach we present in this paper can be used to visualize other sports information, information with competition property, or information with hierarchical structure.