 | Ochi, Makoto
Tennis Player |
|
| Ofner, Sebastian
Tennis Player | |
| Ojeda Lara, Ricardo
Tennis Player | |
| Okala, Jules
Tennis Player | |
| Okamura, Kyoka
Tennis Player | |
| Olaso, Guillermo
Tennis Player | |
| Oliveira, Goncalo
Tennis Player | |
| Olivetti, Albano
Tennis Player | |
| Olivo, Renzo
Tennis Player | |
| Olmos, Giuliana
Tennis Player | |
| Opelka, Reilly
Tennis Player | |
| Ornago, Fabrizio
Tennis Player | |
| Ortega-Olmedo, Roberto
Tennis Player | |
| Osaka, Mari
Tennis Player | |
 | Osaka, Naomi
Tennis Player | |
| Ostapenko, Jelena
Tennis Player | |
| Osuigwe, Whitney
Tennis Player | |
| Otte, Oscar
Tennis Player | |
| Oudin, Melanie
Tennis Player | |
| Oudsema, Scott
Tennis Player | |
| Ozaki, Risa
Tennis Player | |
| Ozgen, Pemra
Tennis Player | |
| 
