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 Valtteri Bottas was ordered to move over in Sochi. 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".–AFP