


Williams have already shown their car has both straight line speed and aerodynamic efficiency. The Mercedes power unit is the pick of the field and the four teams using it should be strong in Spa. Spa is the longest circuit on the calendar and 70 percent of the 7.004 km lap is at full throttle - putting engine reliability and power at a premium. Resurgent Williams have the same engine as the Mercedes works team and both Valtteri Bottas and Felipe Massa have been looking forward to Spa - and Monza in Italy after that - as their best chances of winning this season. Mercedes Formula One driver Lewis Hamilton of Britain prepares for the first free practice session of the Hungarian Grand Prix at the Hungaroring circuit, near Budapest July 25, 2014.
