| 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 |
| Julian Ocleppo | Italy | Right Handed |
| Sebastian Ofner | Austria | Right Handed |
| Ricardo Ojeda Lara | Spain | Right Handed |
| Yshai Oliel | Israel | Left Handed |
| Goncalo Oliveira | Portugal | Left Handed |
| Albano Olivetti | France | Right Handed |
| Genaro Alberto Olivieri | Argentina | Right Handed |
| Renzo Olivo | Argentina | Right Handed |
| Reilly Opelka | United States | Right Handed |
| Roberto Ortega-Olmedo | Spain | Right Handed |
| Philipp Oswald | Austria | Right Handed |
| Oscar Otte | Germany | Right Handed |
| Lamine Ouahab | Morocco | Right Handed |
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