Mercedes say they are determined to extend their performance advantage over the rest of the field despite dominating the start of the season. Lewis Hamilton and Nico Rosberg have won the first four races of the season and the car has proved about a second a lap faster than any rival. But Mercedes sports boss Toto Wolff said: 'Our aim must be to increase the advantage we enjoyed at the last race. 'Our rivals are relentless in their efforts to close the gap.' Ferrari's Fernando Alonso is Mercedes' closest rival in the drivers' championship. The Spaniard is 38 points behind Rosberg, who leads the championship after a win and three second places behind Hamilton in the four races so far. Please...
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