– Mercedes boss Toto Wolff says the outfit must be "relentless" in its efforts over the second half of the campaign, as it looks to seal successive double world titles.Mercedes currently sits 147 points clear of main rival Ferrari, while Lewis Hamilton leads team-mate Nico Rosberg by 21 points, with Sebastian Vettel 42 points back.But having twice lost out to Vettel and Ferrari this season, first in Malaysia and most recently in Hungary, Wolff has urged his team to stay focused on the task ahead."With 10 races down and nine to go, we enter the second half of the season with a stronger points total than at this stage last year," Wolff explained."And yet, our...
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