Lewis Hamilton of Britain. Pictures: REUTERS
Lewis Hamilton of Britain. Pictures: REUTERS

Sochi -Defending champions Lewis Hamilton and Mercedes will seek to tighten their grip on this year’s Formula One world championship with a fifth triumph in five years at the Russian Grand Prix.

No other team has tasted a "vodka-laced" victory since the event began at the former winter Olympic Games venue in 2014. Hamilton won then and in 2015, Nico Rosberg in 2016 and Valtteri Bottas in 2017.

With a 40-point lead on Ferrari’s Sebastian Vettel in the title race, four-time champion Hamilton looks set to go into the final six races of the season in confident fashion after registering four wins in his last five outings.

But Mercedes team boss Toto Wolff has warned against complacency as they enter the most critical spell of the series.

Hamilton’s dazzling triumph in Singapore, where his pole lap was widely regarded as one of the greatest of all time, may have lifted him into a position with a clear advantage, but Wolff has stressed that Ferrari will be a serious threat in every contest.

"Obviously, it’s better to have a lead than not to, but there are six races to go and plenty of points to score, so it doesn’t give us any comfort," he said.

"We will continue to concentrate on every single session, trying to optimise the car in every possible area — and we will go for the race win.

"There is no naive optimism about our situation within the team. Our mindset is very positive, we are energised, the factories are buzzing and we’re excited for the fight we will certainly have in the next six races.

"We have a good track record in Sochi, but we know that Ferrari and Red Bull will give it everything to break our winning streak so we must fight as hard as ever," Wolff said.

He added he will not be surprised to see Bottas recover his best form at a circuit where he won in 2017, despite slipping out of contention in the title race.

Vettel, also chasing a fifth drivers’ crown, knows he has to deliver this time after an unexpected struggle to third place in Singapore.

"I think Russia has been getting better for us in the last few years," he said. "It should suit our car too. I don’t think we have to fear any of the tracks that are coming up now. Our car is working pretty much everywhere and that’s a strength."

Yet Vettel has claimed only one win in five since slipping behind Hamilton in Singapore.

Another victory on a weekend when Hamilton could claim his 80th pole position and 70th win would leave him knowing he can afford to finish second in all five final races and, even if Vettel wins, still be champion.

However, Red Bull could be a serious threat to both Ferrari and Mercedes, as Renault-bound Daniel Ricciardo and Max Verstappen, who will turn 21 on Sunday, try to make the most of the tight street track, which may favour their cars’ performance.