The greatest Olympians of the 21st century
1. Michael Phelps, swimming: Record 28-time Olympic medalist, 23-time Olympic gold medalist, most gold medals at a single Olympics when he won eight at Beijing in 2008. 2. Simone Biles, gymnastics: Seven-time Olympic medalist (tied for most by American gymnast), four Olympic gold medals (2016, tied for most by female