Before practice in Singapore, Sebastian Vettel admitted that "the biggest enemy is me" in Ferrari's attempt to win the 2018 world championship. And so it proved on the opening day of track action at Marina Bay as he struck the wall exiting Turn 21 during the second session.
Friday practice is as good a time as any to ding the wall, and such an error certainly has a significantly smaller impact on a driver's chances for the weekend than doing so in qualifying or the race. But it meant Vettel failed to complete his qualifying simulation and, more importantly, was not able to do any long-run work thanks to the premature end to his session.
Vettel is no fool, and was frank about the errors that have cost him this season - particularly his off in the wet while leading the German Grand Prix. He knows better than anyone that he should be leading the world championship, and with time running out pressure is building not to squander this chance.