world championship.
Vettel was 0.188 seconds faster than his team-mate Mark Webber, while Ferrari's Fernando Alonso suffered a gearbox failure after completing just six laps.
Alonso must score at least 16 points more than Vettel this weekend to prolong the championship but will be out of contention if the German finishes fifth or higher.
Available to UK users only.
Vettel was 0.188 seconds faster than his team-mate Mark Webber, while Ferrari's Fernando Alonso suffered a gearbox failure after completing just six laps.
Alonso must score at least 16 points more than Vettel this weekend to prolong the championship but will be out of contention if the German finishes fifth or higher.
Available to UK users only.
