• Red Bull boss Christian Horner believes Toto Wolff is not used to having such a fierce rival.
• Mercedes have been dominant in the sport for the past seven years.
• Red Bull has been giving Mercedes a hard time in the 2021 season.
• For motoring news, go to News24/wheels.
Christian Horner says that, unlike himself, Toto Wolff isn't used to dealing with a rival, as he hasn't had any in the hybrid era.