[3] Nys has followed in his father's footsteps and has started cyclo-cross from an early age on.

He has already obtained three Belgian and one European cyclo-cross title in the youth categories.

On 2 February 2020, he won the men's junior title at the 2020 UCI Cyclo-cross World Championships.

On 11 September 2021, he added the men's U23 European Road Race Championships in Trento.

As an Elite rider in the 2024/2025 season, Nys took his first European Championship[4] and Belgium National title.