Mercedes boss Toto Wolff believes Lewis Hamilton has "gone up a level" after the championship leader enjoyed another perfect day at the United States GP. Hamilton has won four of the last five Grands Prix and can even seal the 2017 drivers' title in Austin if results go his way, and he made the ideal start to the weekend by topping both practice sessions. Hamilton fastest, Vettel faltersWhy has Verstappen re-signed?When's the US GP on Sky? The Englishman was half a second clear of main championship rival Sebastian Vettel in Practice One before out-pacing Max Verstappen in the next session. "I feel he has gone up a level," Wolff said. "It's the fifth year we have...
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