He was selected to compete at the 2018 IAAF World Indoor Championships, but had to withdraw due to an Achilles tendon issue. Erasmus helped set a South African record of 38.24 seconds in the relay at the 2018 Commonwealth Games, taking the silver medals alongside Henricho Bruintjies, Anaso Jobodwana and Akani Simbine (Simbine and Bruintjies had previously completed a 1–2 individually).