| Serie 1 |
| Borja Correa Correa | Tabancura | 2 | 12.44 | 2 q |
| Santiago Guzmán Díaz | Saint George's College | 6 | 12.46 | 3 q |
| Martin Casali Irarrázabal | Saint George's College | 4 | 12.47 | 4 q |
| Diego Cubas Mardon | Cordillera | 3 | 12.77 | 7 q |
| Tomas Leon Guzman | Verbo Divino | 5 | 12.80 | 8 q |
| Roberto Vergara Chomon | Cordillera | 8 | 13.14 | 10 |
| Ricardo Calvert Lopez | Padre Hurtado y Juanita de los Andes | 1 | DNS | |
| Francisco Silva Fernandez | Padre Hurtado y Juanita de los Andes | 7 | DNS | |
| Serie 2 |
| Maximiliano Matta Schilling | Saint George's College | 1 | 11.74 | 1 q |
| Tomas Irarrazabal Browne | Tabancura | 5 | 12.49 | 5 q |
| Max Prieto Mujica | Tabancura | 4 | 12.67 | 6 q |
| Leon Fuenzalida Urzua | Verbo Divino | 3 | 12.87 | 9 |
| Juan Andres Oyarzun Nualart | Padre Hurtado y Juanita de los Andes | 6 | 13.21 | 11 |
| Tomas Romero Rodriguez | Cordillera | 2 | 13.41 | 12 |
| Cristobal Errazuriz Morelli | Verbo Divino | 8 | 13.42 | 13 |
| Sebastian Streeter Velasco | San Ignacio El Bosque | 7 | 14.14 | 14 |
