Valtteri Bottas admitted that Williams have under-performed so far this season in a car that has the potential to regularly challenge for podiums.
Bottas and his Williams team-mate Felipe Massa have both had chances of finishing on the podium so far this year but have suffered a variety of different problems resulting in a fifth place finish being their most impressive result in 2014 to date.
In the season-opener in Australia, Bottas looked like he could finish in second place before a collision with the wall led to a rear puncture, while both drivers were quick in Bahrain before tyre degradation problems compromised their races.
Massa's Chinese GP was ruined during a wheel mix-up during...
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