| Link | Location |
|---|
| Robert-Jan Opschoor | Den Haag, Paesi Bassi |
| Adam Or | Hong Kong, Hong Kong |
| Alina Orasanu | Munich, Germania |
| Jouko Orava | Vaasa, Finlandia |
| Marta Orbitowska | Szczecin, Polonia |
| Andrés Orduz | Brussels, Belgio |
| Miriam Orejana | Madrid, Spagna |
| Diego Oreona | A Coruña, Spagna |
| Shawna Organisciak | Denver, Colorado, Stati Uniti |
| Cherukei Orianwo | London, Regno Unito |
| Vadim Orlov | Moscow, Russia |
| Dominic Orme | Burgess Hill, Regno Unito |
| Ryan Orndorf | Minneapolis-United Health, Minnesota, Stati Uniti |
| Christoph Ornth | München, Germania |
| Veruska Oropeza | San Francisco, California, Stati Uniti |
