Red Bull's Sebastian Vettel signalled his intention to secure a ninth victory of the Formula One season when the German set a blistering pace in the second free practice session for the Singapore Grand Prix.
The 24-year-old, who has a chance to become the sport's youngest double world champion with five rounds remaining after Sunday night's race, displayed the form that has taken him to the brink of the title with a one minute 46.374 second flying lap.
Ferrari's Fernando Alonso was second quickest, 0.201 seconds behind Vettel, as the Spaniard seeks to record a third victory around the Marina Bay Circuit in the fourth year of the race's existence.
The only other man to win Formula One's only night race is Lewis Hamilton and the Briton followed up his fastest time in a curtailed first practice session by taking third place on the timesheets in his McLaren after lapping in 1:47.115.
