Born and schooled in George, South Africa, van der Merwe made two appearances for Pretoria Super Rugby franchise, Blue Bulls, after playing for the club’s U19 and U21 sides before making the move to the northern hemisphere.
Van der Merwe wing also represented South Africa at U20 level in the 2014 Junior World Championship. He is the brother of Lions hooker Akker van der Merwe.
The Springbok age-grade internationalist joined French Top 14 club Montpellier on an Academy deal in July 2016, and went onto make three league appearances for the senior side, crossing the whitewash on each occasion.
In May 2017, Duhan signed for Edinburgh Rugby until at least May 2019 and extended his deal in February 2018.
In January 2020, the winger signed a new contract extension with Edinburgh after 57 appearances and 155 points scored.
(LS June 29, 2020)
|2017 - present|
|South Africa U20's
|2014 - 2017|
|2016 - 2017|