| Serie 1 |
| Daniel Larco Albertini | Saint George's College | 11.36 | 1 q |
| Sebastian Nuñez Rodillo | The Grange School | 11.41 | 2 q |
| Tomas Rabat Barros | Tabancura | 11.58 | 3 q |
| Eduardo Mackay Delaveau | San Anselmo | 11.83 | 4 |
| Jose Ignacio Ramirez Bresciani | SSCC Manquehue | 12.12 | 5 |
| Noah Jacobsen A | Alemán de Santiago | 12.40 | 6 |
| Matias Villaseca Torres | San Anselmo | | |
| Serie 2 |
| Joaquin Alberto Daza Herrada | Liceo Bicentenario - Talagante | 11.45 | 1 q |
| Joaquin Torres Kolbach | Verbo Divino | 11.67 | 2 q |
| Juan Miguel Ovalle Valdés | Verbo Divino | 11.85 | 3 |
| Esteban Löb De La Fuente | Alemán de Santiago | 11.92 | 4 |
| German Maldonado Rottmann | Trebulco School | | |
| BenjamÃn Valenzuela Etchepare | San Anselmo | | |
| Serie 3 |
| Bastian Goldner Ortega | Alemán de Santiago | 11.62 | 1 q |
| Leon Clemente Walker Depassier | SSCC Manquehue | 11.66 | 2 q |
| Nicolas Ortiz Ibañez | Padre Hurtado | 12.01 | 3 |
| Clemente Hevia Valdivieso | Tabancura | 12.06 | 4 |
| Lucas Bakovic Briones | Padre Hurtado | 12.45 | 5 |
| Tomás Irarrázaval Varela | Cumbres | | |
| Serie 4 |
| Diego Molina Torres | Verbo Divino | 11.66 | 1 q |
| Arturo Hulaud Paredes | Sankt Thomas Morus | 11.69 | 2 |
| Victor Daniel Cortes Arriagada | Institución Teresiana | 11.93 | 3 |
| José Ignacio Piffaut Urzúa | San Anselmo | 12.03 | 4 |
| Raimundo Lazo Rivera | SSCC Manquehue | 12.21 | 5 |
| MartÃn Montes Urrutia | Cumbres | | |
