LEWIS HAMILTON expects Nico Rosberg to bounce back after his Formula One World Championship challenge all but ended in Russia on Sunday.

Rosberg, who started on pole in Sochi, saw off the challenge from Hamilton on the first lap to lead the opening phase of the race.

But for the second time in the last four grands prix, Rosberg was struck down by a mechanical gremlin and he retired from the race on lap seven.

Hamilton marched on to claim victory meaning he now leads his Mercedes team-mate by an almost unassailable 73 points with just four races on the calendar remaining.

Indeed Rosberg will be eliminated from this season's championship battle if Hamilton outscores him by a mere two points in Texas later this month.

"Nico will come strong next year for sure, as he will at the next race, and as he was already yesterday," said Hamilton, whose closest title challenger is now Ferrari's Sebastian Vettel, 66 points adrift.

"I was excited because we were quite close together at the beginning and I was thinking, 'okay, we have got a race here'. It is a shame for the team to have lost one of the cars and to not have a race."

For Hamilton, the 30-year-old is now firmly fixed to become the first British driver to successfully defend his grand prix crown.

He surpassed his idol Ayrton Senna with his 42nd career victory here on Sunday and is poised to join the great Brazilian as a triple world champion, too.

A win at the Circuit of Americas in a fortnight's time - a race he won last year and in 2012 - with Vettel finishing third or lower will be the clincher.

He added: "For me, those last five laps I was just really taking it in. I don't know how many times I will be in that position again, so I was just cherishing the moment and feeling really blessed. I love this car and I am truly grateful."

To cap a remarkable day for Hamilton, his Mercedes team also sealed back-to-back team titles after Ferrari's Kimi Raikkonen was demoted from fifth to eighth by the stewards after a last-lap collision with Valtteri Bottas.

Hamilton concluded: "I did feel that the guys were going to do a good job, I just did not know it was going to be this good. They have done a better job this year than they did last year.

"There are always opportunities to make silly mistakes so I was proud of how I drove here. I feel like I have solidified my spot in the team in terms of delivering what they had expected and hoped. I am going to try and continue that."