As Sebastian Vettel stand on the cusp of securing a fourth successive Drivers' crown, Christian Horner admits he "never thought" it would happen.
Vettel came from behind to win his first Drivers' Championship title in 2010 and has dominated the sport ever since.
This season a run of four consecutive race victories has seen the German gain a 77-point advantage over Fernando Alonso in the battle for the title.
As a result Vettel could wrap up the title - his fourth successive - this weekend in Japan, all he needs to do is win the race and have Alonso finish ninth or lower.
"If we are to achieve it, then it would be massive," said Horner.
"To win it the first time was...
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