Tauranga triathlete Lachlan Haycock is just three years into his career but will represent his country on the world stage in August.

The 19-year-old will be part of the New Zealand Junior team to compete at the World Triathlon Championships in Switzerland, in what has already been a big year for the former Tauranga Boy's College student.

Haycock won the New Zealand junior sprint title in February and was second in the junior division at the Sprint Triathlon Oceania Championships in Tasmania the following month.

Haycock says racing at the world champs will be a great experience, but he is