He is a multiple time national champion over 800 metres and the current New Zealand record holder.
[3] Preston had a breakthrough result as an 18 year-old when he won the 800m at the Porritt Classic in New Zealand in February 2016, beating New Zealand champions Brad Mathas and Hamish Carson, and breaking his personal best by three seconds.
[4] In March 2022, Preston won his second New Zealand national title over 800 metres.
[5] In July 2022, he became the third fastest 800m New Zealand athlete in history, behind Peter Snell and John Walker, when he ran 1:45.30 in Germany.
[6] In February 2023, Preston won the 800m at the World Athletics Continental Tour Gold Meet in Melbourne in a world-leading time.