| Serie 1 |
| Tomas Vial Ruiz Tagle | Tabancura | 7 | 11.25 | 1 q |
| Cristóbal Pedro Bernales Magnere | Verbo Divino | 2 | 11.90 | 5 q |
| Martín Andrés Del Río Altaner | Liceo Bicentenario de Ancud | 1 | 11.91 | 7 q |
| Patricio Busquet Llona | San Benito | 6 | 11.92 | 8 q |
| Alvaro Ochoa Bravo | Liceo Bicentenario Colegio San Miguel Arcangel | 4 | 12.12 | 10 |
| Jacques Antoine Caussade Margozzini | The Newland School | 3 | 12.15 | 11 |
| Serie 2 |
| Andrés Fernández Valdés | San Benito | 2 | 11.43 | 2 q |
| Raimundo Velasco Barañao | Verbo Divino | 6 | 11.51 | 3 q |
| Diego Basaure Larrain | Tabancura | 8 | 11.87 | 4 q |
| Vicente Manriquez Gabelic | The Mayflower School | 3 | 11.90 | 6 q |
| Felipe Kunstmann Valdivia | Cordillera | 5 | 12.06 | 9 |
| Julio Nazar Diemer | Alianza Francesa | 7 | 12.46 | 13 |
| Joaquin Alfonso Carrasco Villagran | Institución Teresiana | 1 | 12.56 | 14 |
| Serie 3 |
| Andrés Delgado Gaete | The Southern Cross School | 4 | 12.37 | 12 |
| Benjamin Diaz Latrach | The Mayflower School | 5 | 12.57 | 15 |
