| Xtravaghan | Canterbury Park,
09-Dec-22 |
| Xtrayya | Ladbrokes Cannon Park,
09-Sep-23 |
| Xtreme | Ballarat Synthetic,
15-Jul-25 |
| Xtreme Diva | Keeneland,
12-Oct-25 |
| Xtreme Mayhem | Turf Paradise,
01-May-25 |
| Xtreme Smoke Show | Keeneland,
06-Oct-25 |
| Xtreme V. I. P. | Turf Paradise,
02-Jan-23 |
| Xtremly | Sunland Park,
06-Jan-25 |
| Xuanfeng | Ipswich,
27-Oct-25 |
| Xuannu | Murwillumbah,
21-Jan-23 |
| Xureb | Scone,
23-Nov-15 |
| Xuxesso | Gavea,
22-Jan-24 |
| Xuxo Lui | Valparaiso Sporting Club,
15-May-25 |
| Xy Face | Fonner Park,
04-May-25 |
| Xy Speed | Gulfstream,
27-Oct-25 |
| Xy Time | Tampa Bay Downs,
13-Feb-25 |
| Xylina Warrior | bet365 Park Kilmore,
11-May-23 |
| Xylitol Choco | Kasamatsu,
24-Mar-25 |
| Xylocope Val | Saint Brieuc,
15-Nov-23 |
| Xylophone | ParisLongchamp,
19-Oct-25 |
| Xylophone | Horseshoe Indianapolis,
23-May-24 |
| Xyngin Spitfire | Remington Park,
18-Oct-25 |