- Sebastian Vettel wins Singapore Grand Prix
- Title leader Lewis Hamilton retires with technical fault
- Vettel and Nico Rosberg close up in title race
- Spectator on track causes safety car
(CNN)Even an intruder who risked life and limb by wandering on to the track during a Formula One race could not prevent Sebastian Vettel from racing to a pole to checkered flag victory in an incident-packed Singapore Grand Prix Sunday.