Postpublished at Lap 47/52
Another mistake by Valtteri Bottas and Sebastian Vettel will pounce. The Ferrari is right on the tail of the Mercedes.
Tense times...
Image source, ReutersSummary
Bottas wins Vettel after overtaking him at start
Vettel 2nd, Raikkonen 3rd, Hamilton 4th
Alonso breaks down on parade lap
Alonso, Palmer, Grosjean, Ricciardo out
Postpublished at Lap 47/52
Image source, ReutersPostpublished at Lap 46/52
Valtteri Bottas is fastest of anyone through the first sector but Sebastian Vettel has the edge through the final two seconds and the four-time world champion takes four tenths out of Bottas' lead.
Vettel is just 1.3 seconds behind Bottas.
My word, the pressure on Bottas is unreal.
Postpublished at Lap 45/52
Valtteri Bottas promptly finds a bit more to increase the gap between himself and Sebastian Vettel to two seconds. He was half a second quicker than Vettel on the last lap.
Postpublished at Lap 44/52
Mercedes are on the radio to Valtteri Bottas but the Finn wants silence.
"I want less talking," he says.
These are massive laps for him as he chases his first-ever win in Formula 1.
Image source, ReutersPostpublished at 14:22 British Summer Time 30 April 2017
Postpublished at Lap 43/52
Valtteri Bottas' lead is now down to 1.5 seconds.
Felipe Massa pits for a second time and is back out in ninth on the ultrasofts.
Top 10 as it stands:
1) Bottas 2) Vettel 3) Raikkonen 4) Hamilton 5) Verstappen 6) Perez 7) Ocon 8) Hulkenberg 9) Massa 10) Sainz
Image source, ReutersTEN LAPS TO GOpublished at Lap 42/52
Nico Hulkenberg finally pits having squeezed 41 laps out of the ultrasofts. He's onto the softs and back out in ninth. Another points finish on the cards for the Renault driver.
Postpublished at Lap 41/52
Valtteri Bottas needs the kind of nerves the Sochi circuit helicopter pilot has, loves a low flyover.
The gap between Bottas and Sebastian Vettel is now down to 1.8 seconds.
Time to see what Bottas is made of.
Image source, EPAget involved Get Involvedpublished at 14:15 British Summer Time 30 April 2017
Postpublished at Lap 40/52
A smidgen of good news for McLaren fans. Stoffel Vandoorne is still going. He is currently 14th with 12 laps to go.
Postpublished at 14:14 British Summer Time 30 April 2017
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End of twitter postPostpublished at Lap 39/52
Ferrari are straight on the radio to tell Sebastian Vettel about what happened to Valtteri Bottas.
"He went wide at Turn 13. He has a big flat spot on the left-front."
Music to Vettel's ears.
Postpublished at Lap 38/52
Eeek!
Valtteri Bottas loses a BIG chunk of time with a lock up. He just manages to avoid scraping into the wall as he runs wide at Turn 13.
The gap is now down to three seconds...
Image source, EPAget involved Ah, Penfoldpublished at 14:11 British Summer Time 30 April 2017
Postpublished at 14:11 British Summer Time 30 April 2017
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End of twitter postPostpublished at Lap 37/52
Nico Hulkenberg, currently sixth, slides around a corner. He hasn't stopped now and the Renault looks to be struggling on those heavily worn ultrasofts.
Postpublished at Lap 36/52
Russia president Vladimir Putin has just turned up, shaking hands with Bernie Ecclestone on arrival.
On the track, this is Valtteri Bottas' race to win if he can hold his nerve. The gap between himself and Sebastian Vettel remains 4.6 seconds.
Lewis Hamilton, meanwhile, looks set to miss out on a place on the podium. He's fourth, 14 seconds behind Kimi Raikkonen.
Image source, Getty ImagesListen: Alonso 'sad' at latest failurepublished at 14:07 British Summer Time 30 April 2017
Media caption, Fernando Alonso reacts to the latest technical failure with his car
Postpublished at Lap 35/52
Bit of a slow stop for Sebastian Vettel but his crew get the job done and he is back out on supersofts and ahead of Kimi Raikkonen.
Valtteri Bottas is back as race leader with Vettel 4.6 seconds behind.
'Not what we were expecting'published at 14:06 British Summer Time 30 April 2017
Red Bull's Daniel Ricciardo has been speaking about his early retirement with brake failure.
"It was not really expected," he told BBC Sport. "Maybe the the safety car and two starts had an effect but it was not what we were expecting.
"We know this track is tough on brakes but we did not expect it to have such an effect. We need to understand that."
Image source, EPA