Williams driver Felipe Massa was left to lament an "unlucky" race in Singapore, as he retired for the first time since last year's German Grand Prix.
Massa made contact with Force India's Nico Hulkenberg following the first round of pit stops and was later forced onto the side lines when his FW37 entered neutral.
"It was a very unlucky race for me," said Massa, who slipped to sixth in the championship.
"My problems started with the collision I had with Hulkenberg after my first stop. I was braking for the corner and he turned his car in on mine, leaving me with nowhere to go, so we hit.
"This caused a slow puncture on my front-right tyre and the extra pitstop put me back many positions. I then had a gearbox problem.
"I was changing gears from 2nd to 3rd and was getting neutral. It seemed to resolve itself but it happened again and I had to retire the car. It was one of those races where things just weren't going my way. We need to concentrate on recovering some of our lost points at the next race."