After an unprecedented pandemic delay, the opening ceremony of the Tokyo Olympics will finally begin on Friday. And while there are many superstars competing (Simone Biles, Katie Ledecky and Allyson Felix, to name three), there also are other names you might not know yet -- but should. Here, 25 of the most compelling Olympians this year:
Simone Biles, gymnastics
Biles, 24, is a five-time world all-around champion and the defending Olympic champ. She was the best gymnast on the competition floor in Rio in 2016, and four years later, she is only more dominant.