Toto Wolff has called on Mercedes to be "relentless" in its pursuit of a bigger advantage over the rest of the F1 field.

Mercedes has won all four of the opening races by a comfortable margin to open up a lead of almost 100 points over Red Bull in the constructors' championship. However, with team bringing major upgrades to the Spanish Grand Prix next weekend, Wolff doesn't want to see the advantage his team holds being reduced at all.

"We are now four races into the 2014 season and hold a strong position in both Championships," Wolff said. "However, the first European round of the year always provides a prime opportunity for teams to arrive with improvements to their cars.

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"Of course, we are no different to any other team in that respect and our aim must be to increase the advantage we enjoyed at the last race in China. We have seen already that our rivals are relentless in their efforts to close the gap. As a team, it is up to us to rise to that challenge: to take that relentless mentality to an even greater extent than those around us. If we are to build a sustained level of success in this sport, any small advantage must be seen as a platform upon which to build a bigger advantage."

And Wolff added that Mercedes can't get carried away even if it does win again in Spain.

"We head to Barcelona on good form and in high spirits. But, most importantly, we approach the next race weekend as we approached the first: in the knowledge that there is still a long season ahead and anything can happen."