Sport: Tennis
Country: Japan
Naomi Osaka made headlines last year when she renounced her American citizenship, allowing her to compete for Japan in the Olympics. (A dual US-Japanese citizen, Osaka was required under Japan's Nationality Law to choose one before she turned 22 last October.) It'll be her first Olympic Games and she'll be playing in her home country, looking to become the first Japanese woman to take home an Olympic medal in tennis, so expect exciting, sell-out matches and major attention from fans. With fierce competition, including Serena Williams (currently ranked ninth in the world to Osaka's 10th), it'll be a tournament to watch.
Image Source: Getty / Tim Clayton - Corbis / Contributor