Professional tennis player Naomi Osaka has experienced a lot of firsts. She's been ranked number-one in singles by the Women's Tennis Association and was the first Asian player to achieve that honor. Her success is not overnight, though. Born in Japan, Osaka has been training in the United States since she was three. Readers of this accessible biography will learn about Osaka's childhood, her early successes, and her mighty serve! They'll also learn about her interest in helping others off the court and what's next for this bright star of the tennis world.