Info
| Last name | Koster |
| First name | Sebastian |
| Nationality |  United States |
| Date of birth | 08-10-2007 |
| Age | 18 |
Results
| Date | Rank | Race | |||||
|---|---|---|---|---|---|---|---|
| 31-08 | DNF |  La Route des Géants (1.1) | |||||
 Vuelta Junior a la Ribera del Duero (2.1) | |||||||
| 22-08 | DNF | Stage 1Sotillo de la Ribera - Baños de Valdearados (85.0km) | |||||
 La Ronde Des Vallées (2.1) | |||||||
| 17-08 | 22 | Stage 2aSaint-Caradec - Hémonstoir (11.0km) | |||||
| 17-08 | 109 | Stage 2bHémonstoir - Hémonstoir (104.0km) | |||||
| 16-08 | 63 | Stage 1La Prénessaye - La Prénessaye (105.0km) | |||||
| 24-05 | 28 | National Road Championships - USA U19 (CN) | |||||
| 20-05 | 12 | National Road Championships - USA TT U19 (CN) | |||||
| Tour du Bocage et de l'Ernée 53 (2.1) | |||||||
| 30-03 | 40 | Stage 2aAmbrières-les-Vallées - Ambrières-les-Vallées (13.0km) | |||||
| 30-03 | 84 | Stage 2bAmbrières-les-Vallées - Ambrières-les-Vallées (105.0km) | |||||
| 29-03 | 120 | Stage 1Montenay - Montenay (118.0km) | |||||