Having taken a 28-point lead over Sebastian Vettel in Singapore, Toto Wolff says Mercedes and Lewis Hamilton must not let up. Hamilton became the first driver this season to win three on the trot when he triumphed in Singapore on Sunday night. The British racer's three successive win saw him overturn a deficit to Vettel and take a 28-point lead in the Drivers' standings. But with six races remaining, 150 points in total, motorsport boss Wolff concedes that the battle is by no means over. 'We musn't drop the ball,' he said, 'but clearly you wouldn't feel comfortable in Ferrari's shoes having a 28-point deficit.  'So whatever the perspective is, from my opinion, and this is how we've...
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