ATP Players |
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z | |||
| O | |||
| Name | Country | Plays | |
| Christopher O'Connell | Australia | Right Handed | |
| Jonny O'Mara | England | Right Handed | |
| Sebastian Ofner | Austria | Right Handed | |
| Goncalo Oliveira | Portugal | Left Handed | |
| Albano Olivetti | France | Right Handed | |
| Renzo Olivo | Argentina | Right Handed | |
| Reilly Opelka | United States | Right Handed | |
| Philipp Oswald | Austria | Right Handed | |
| Oscar Otte | Germany | Right Handed | |
| Lamine Ouahab | Morocco | Right Handed | |
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