Nick Pearman:  Lewis really unlucky there. 4th place for Rosberg doesn't affect his title chances hugely though. Only reliability can stop him.

Aaman Khan:  Spare a thought for @LewisHamilton, external to be sooo close to equalling Senna's record and to be let down by his engine.

Tom Howells:  Do people realise that if #Vettel, external does win the #SingaporeGP, external, he actually passes #Senna, external's 41 race record, in 10 less races?

Simon Park:  Last time out the championship looked all but over, now Rosbergand maybe Vettel are right back in it.

McLaren fans, don't despair though because get this: Jenson Button is now up to EIGHTH. He's had his problems today, and provided us with many a witty radio remark, but he is now looking on for some serious points in Singapore.

Tom Brookes:  Lewis had the chance of making this an exciting race, his inevitable retirement has killed it.

Stephen:  Should never have dyed his hair blonde. Let that be a lesson Lewis.

Another retirement as Fernando Alonso follows Lewis Hamilton into the pits to bring an end to his race.

He retires from ninth and this marks the first time Alonso has not scored points in Singapore.

In contrast to Lewis Hamilton's race, it is all going perfectly for Sebastian Vettel out in front. He is now cruising along with a 4.4s advantage over Daniel Ricciardo with 34 laps gone.

That is it for Lewis Hamilton. "Box, box," he is told over the radio. A first non-finish of the season for the reigning world champion.

Lewis Hamilton: "Guys, we could be killing the engine here. Why don't we save it. I'm just going further and further back."

Engineer: "Okay, Lewis. We are just discussing that."

It is sounding increasingly likely that Lewis Hamilton is going to retire. He suggests over the radio that they should consider saving the engine as he continues to fall further back.

Ben Edwards
BBC F1 commentator

"Hungary is the only other race Hamilton has not led so far this year."

Image source, ap

Ah bad news for Felipe Massa. He has to retire, the problem which caused him to suddenly go into neutral proving race-ending.

Mercedes on Twitter:  This is desperate for the World Champ. Trying everything to spark back into life...

David Coulthard
BBC F1 co-commentator

"Is it the poltergeist of Singapore catching up with a few of the cars here?"

Williams' Felipe Massa (currently 11th): "I don't know what's happened - I've just gone to neutral."

Lewis Hamilton's latest lap is 2:04.969 and he is now down to 10th.

Meanwhile, Marcus Ericsson and Carlos Sainz head in on lap 30 for their second stops of the race, switching to supersofts.

"Try HPP Driver default 01," Lewis Hamilton is told over the radio. "It doesn't work," is the reply.

Plenty of code chat, there, but Hamilton is still going.

Lewis Hamilton is now down to EIGHTH. What's going on?

"Come on guys, how do I reset the throttle?" he asks over team radio.

Meanwhile, Sebastian Vettel has turned it up at the front of the pack, he now leads Daniel Ricciardo by 3.2s.

David Coulthard
BBC F1 co-commentator

"We have got to presume there is no visible signs of problem with Hamilton's engine so it must be the recovery system."

Oh it is bad!

He is dropping away massively and Nico Rosberg storms past. Hamilton is hammering the buttons, trying to find a solution but nothing is working.

Is he in danger of not even finishing the race!??

Lewis Hamilton reports a loss of power, he is still running but has dropped back a little bit on Kimi Raikkonen.

"Quick guys, quick," says Hamilton, sounding very worried.