Lewis Hamilton says he had the pace to claim victory in the Singapore Grand Prix before being forced out of the race due to a mechanical failure.
Hamilton and Mercedes has struggled throughout the weekend but the Briton occupied fourth place during the second stint of the race and was only a few seconds behind race leader Sebastian Vettel, with the trio ahead of Hamilton on Option tyres and the Mercedes driver on Primes.
However, Hamilton suffered a loss of boost pressure caused by the failure of a clamp between the intercooler and plenum, dropping him down the order before he pulled into the pits to retire.
"The race was going very well," he said. "For me it felt like I was driving at my best in the race. I think I had the pace to win. I did everything.
"I was on the prime keeping up easily with the guys at the front on the option. My pace was really good when I started to lose power. I felt like the team was working as hard as they could and these kinds of things just happen.
"It's unfortunate for the team as I was feeling real good out there, so optimistic. But it was better to retire and save the engine.
"We will work really hard on figuring out what it was but I am not worried about losing this engine. Our reliability is really high as we had an amazing season so far."
Hamilton now leads Nico Rosberg in the standings by 41 points, after the German driver salvaged fourth position.