'Hungry' Hamilton seeks Japan boost after Russian rumpus

Tokyo. Lewis Hamilton will be looking to restore normal service at the Japanese Grand Prix after being gifted a controversial victory by Mercedes in Russia last weekend.

But the runaway Formula One championship leader appears to have complicated that task by refusing to rule out leaving Mercedes when his current contract expires in 2020.

Hamilton was allowed to claim a 70th career win when ValtteriBottas was ordered to move over in Sochi -- with the world champion describing it as "the strangest day" of his career.

//The Briton, who has opened a 50-point advantage over Ferrari's Sebastian Vettel with five races left this season, will want to prove he can win in his own right at Suzuka this week as he chases a fifth title.

Vettel called the decision by Mercedes to sacrifice a rare Bottas victory and extend Hamilton's championship lead a "no-brainer".

However, Hamilton's eighth win of the season and third in a row left the Silver Arrows red-faced and sparked fresh debate over team orders with many Formula One fans taking to social media to vent their anger.

Despite the criticism, Mercedes team boss Toto Wolff insisted he had no regrets about issuing the instruction to let Hamilton pass.

"I'd rather be the baddie today than the idiot at the end of the year," he said. "Rationally it was the right call."

Wolff expects Hamilton, who won in Japan for the fourth time last year, to continue his dominance this weekend.

"Lewis is hungry, focused and completely determined to succeed," the Austrian told reporters.

"It has been great to see the power he has brought to this championship and how he's taken it to the next level since the summer break."

- 'Unbeatable unit' -

But Hamilton has set tongues wagging in the build-up to the race by hinting he could leave Mercedes after his present deal runs out.

"I've given them a lot," Hamilton told Swiss newspaper Blick.

"Mercedes and Hamilton -- that's an almost unbeatable unit. I don't know, ask me again at the end of 2020," he added when quizzed about his future.