Horses in United States
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| Name | Last Run |
|---|---|
| Open The Scrolls | Will Rogers Downs, 15-Oct-25 |
| Open Til Midnight | Belmont Park, 03-Jul-23 |
| Open To Question | Down Royal, 06-Sep-25 |
| Opening Buzz | Gulfstream, 02-Jan-24 |
| Opening Hours | Charles Town, 30-Mar-24 |
| Openthegate | Gulfstream, 07-Jan-23 |
| Opera Singer | ParisLongchamp, 15-Sep-24 |
| Operation Overlord | Gulfstream, 10-Jan-26 |
| Operation Sunrise | Churchill Downs, 28-Nov-25 |
| Operation Torch | Gulfstream, 02-Feb-26 |
| Operatnthunderbolt | Gulfstream, 19-May-25 |
| Operatore Pazzo | Churchill Downs, 07-Nov-24 |
| Ophelias Dream | Penn National, 21-Nov-24 |
| Opie's Girl | Mahoning Valley, 29-Jan-25 |
| Opinionated | Laurel Park, 17-Dec-23 |
| Oppo Taco | Charles Town, 17-May-24 |
| Opportune Notion | Delaware Park, 24-Jul-25 |
| Opportune Notion | Delaware Park, 16-Oct-25 |
| Opportunity Set | Belmont At The Big A, 23-Jun-24 |
| Oppose | Colonial Downs, 28-Aug-25 |
| Opposite The Crowd | Gulfstream, 18-Jan-26 |
| Opposites Attract | Gulfstream, 27-Jun-25 |
| Oppy | Horseshoe Indianapolis, 23-Oct-25 |
| Opry | Mountaineer, 09-Oct-25 |
| Opt In | Fair Grounds, 21-Dec-25 |
| Optic Way | Monmouth Park, 09-Jun-25 |
| Optical | Churchill Downs, 29-Sep-25 |
| Optical Bijou | Laurel Park, 28-Nov-25 |
| Optical Illusion | Los Alamitos Racecourse, 12-Jan-26 |
| Optimal | Fonner Park, 12-Apr-25 |
| Optimal Courage | Oaklawn Park, 06-Feb-26 |
| Optimal Trip | Lone Star, 04-May-25 |
| Optimistic Cowgirl | Lone Star, 06-Jul-25 |
| Optimistic Income | Horseshoe Indianapolis, 07-Aug-25 |
| Optimistic Nate | Charles Town, 06-Nov-25 |
| Optimistic Valor | Assiniboia Downs, 25-Sep-24 |
| Optimistic Woman | Will Rogers Downs, 23-Apr-24 |
| Optimizme | Mahoning Valley, 04-Jan-24 |
| Optimus Kat | Remington Park, 17-Oct-25 |
| Option | Fairmount Park, 25-Oct-23 |
| Opulent Ways | Mahoning Valley, 08-Jan-26 |
| Opus | Gulfstream, 13-Nov-23 |
| Opus Forty Two | Laurel Park, 13-Apr-25 |
| Opus Uno | Oaklawn Park, 04-Jan-26 |
| Opynunated | Will Rogers Downs, 05-Nov-25 |
| Or Kimacoy | Sunray Park, 11-May-24 |
| Or Magique | Turfway Park, 06-Feb-26 |
| Ora Certa | Turfway Park, 10-Jan-26 |
| Oracle Of Paradise | Santa Anita, 05-Oct-25 |
| Oraia | |
| Oraia | Turfway Park, 11-Jan-26 |
| Orange Canyon | Charles Town, 12-Oct-25 |
| Orange Diablo | Oaklawn Park, 21-Dec-25 |
| Orange Freeze | Belmont At The Big A, 14-Oct-23 |
| Orange Juice | Charles Town, 27-Nov-25 |
| Orange Lake | Gulfstream, 10-Mar-25 |
| Orange Theory | Turf Paradise, 10-Apr-25 |
| Orange Thunder | Santa Anita, 23-Feb-25 |
| Orangeburg | Charles Town, 17-Nov-24 |
| Orashi | Penn National, 02-Mar-24 |