Robert Kubica has underlined the belief that Renault could be a major force in this year's Formula One series with the fastest time of the first pre-season test in Valencia.
The Pole set a lap time 0.163 seconds faster than Ferrari's Fernando Alonso yesterday.
The final day brought less success for Ferrari, whose driver Felipe Massa lost a day's running following an oil leak which resulted in his car catching fire.
The Australian Mark Webber concentrated on long runs - with impressive pace - for Red Bull.
