Players: O
52 players by surname. Players with two surnames are listed under both.
| Player | Nationality | Handicap | Value |
|---|---|---|---|
| Patrick O'Dwyer | — | unrated | — |
| Paco O’Dwyer | — | unrated | — |
| Paul Oberschenider | Germany | unrated | $50,000 |
| Christian Oberschneider | Germany | unrated | $50,000 |
| Agustin Obregon | Argentina | 3 | $50,000 |
| Facundo Obregon | Argentina | unrated | $50,000 |
| Geronimo Obregon | Argentina | 6 | $71,000 |
| Juan Martin Obregon | Argentina | 6 | $55,000 |
| Mariano Obregon | Argentina | 6 | $121,000 |
| Matias Obregon | Argentina | 4 | $50,000 |
| Tomas Obregon | Argentina | 4 | $50,000 |
| Jorge Fernandez Ocampo | Argentina | unrated | $50,000 |
| Jorge Fernandez Ocampo jr | Argentina | unrated | $50,000 |
| Lucio Fernandez Ocampo | Argentina | 6 | $50,000 |
| Felipe Marquez Ochoa | Argentina | 6 | $50,000 |
| Mariano Gutierrez OFarrell | Argentina | unrated | $50,000 |
| Pedro Gutierrez OFarrell | Argentina | unrated | $50,000 |
| Todd Offen | Canada | unrated | $50,000 |
| Slaney OHanlon | United Kingdom | unrated | $50,000 |
| Francoise Okala | France | unrated | $50,000 |
| Eulogio Olariaga | Argentina | unrated | $50,000 |
| Saffron Oliver | United Kingdom | unrated | $50,000 |
| Miguel Olivera | Argentina | 3 | $50,000 |
| Octavio Olmedo Guerra | Argentina | unrated | $50,000 |
| Gabriel Omar Batistuta | Argentina | unrated | $50,000 |
| Lyad Omari | United Kingdom | unrated | $50,000 |
| Khalid Al Omran | Saudi Arabia | unrated | $50,000 |
| Dolores Onetto | United States | unrated | $50,000 |
| Alfredo Ontiveros | Argentina | unrated | $50,000 |
| Nicholas Van Oppen | — | unrated | — |
| Nick Van Oppen | Swaziland | 1 | $50,000 |
| Arabella Oppenheimer | United Kingdom | 1 | $50,000 |
| Luis Felipe Ordas | Spain | unrated | $50,000 |
| Martin Ordinas | Argentina | 3 | $50,000 |
| Eden Ormerod | United Kingdom | unrated | $50,000 |
| Laura Ormerod | United Kingdom | unrated | $50,000 |
| Peter ORorke | United Kingdom | unrated | $50,000 |
| Luis Orquera | Argentina | unrated | $50,000 |
| Robert Orthwein | United States | 4 | $50,000 |
| Steve Orthwein | United States | unrated | $50,000 |
| Bautista Ortiz de Urbina | Argentina | 6 | $50,000 |
| Andrea Quintero Ospina | — | unrated | — |
| Daniel Otamendi | Argentina | unrated | $50,000 |
| Diego Gaston Otamendi | Argentina | unrated | $50,000 |
| Gastón Otamendi | — | unrated | — |
| Kirstie Otamendi | Argentina | 5 | $50,000 |
| Santiago Otamendi | Argentina | 5 | $50,000 |
| Matias Gonzalez Otharan | Argentina | 2 | $50,000 |
| Mats Ottoson | United Kingdom | unrated | $50,000 |
| Morgan Van Overbroek | Switzerland | 1 | $50,000 |
| Tomas Oviedo | Argentina | unrated | $50,000 |
| Louise Owen | United Kingdom | unrated | $50,000 |