The world's best Olympic athletes to watch at Tokyo 2020, including Simone Biles and Caeleb Dressel From swimming and athletics to new sports such as karate, skateboarding and surfing, who is set to dominant the scene? Some of the world's very best sports stars This year's delayed Olympic Games in Tokyo will feature 11,000 athletes from all over the world competing across 33 sports, including the five new additions of surfing, skateboarding, karate, sport climbing and baseball/softball. New names will be made and reputations enhanced for those already on the big stage. We take a look at 20 individuals already at the peak of their game and expected to challenge for top honours in Tokyo.