The Top 10 Best Athletes of the 21st Century According to ESPN 💪 Choose your Favorite ? (1-10)👇 1. Michael Phelps 2. Serena Williams 3. Lionel Messi 4. LeBron James 5. Tom Brady 6. Roger Federer 7. Simone Biles 8. Tiger Woods 9. Usain Bolt 10. Kobe Bryant #sport #athletes #world #century