Sebastian Vettel had to contend with a crazed track invader and two safety cars before claiming his third victory of the season at an incident-packed Singapore Grand Prix.
The Ferrari driver slashed the gap to Lewis Hamilton in the championship after the Briton suffered his first retirement of the year.
Red Bull's Daniel Ricciardo finished second with Ferrari's Kimi Raikkonen completing the podium places. Nico Rosberg, Hamilton's closest rival in his quest for back-to-back titles, crossed the line in fourth. For Hamilton it was his first retirement since last year's Belgian Grand Prix.
Moments after his retirement the safety car was back out for a second time after a spectator had managed to enter the track. "There is a fan on the track," shouted Vettel on the team radio. The man casually wandered alongside the speeding cars before voluntarily jumping back over the barrier.
The incredible incident will call into question the security at this unique street circuit.