Singapore: Lewis Hamilton converted his stunning pole position into a victory at the Singapore Grand Prix on Sunday as the Briton tightened his grip on a fifth Formula One world championship title.

Once Hamilton got a clean start at the Marina Bay Street Circuit, he controlled the race from the front and although he stretched his advantage over Sebastian Vettel to 40 points with six races remaining, the Briton admitted he was shattered.

"I'm spent! That was a tough race, I have such great support here and we had a great start," Hamilton said after claiming victory at the 23-turn floodlit circuit for the fourth time in his career.

"The team had never given up faith and belief in me and (teammate) Valtteri (Bottas). That was the longest race in my life and its a blessing. I'm just blessed.

"It was long, but it was still fun. Driving this track is incredible, especially with these cars."