nico rosberg and lewis hamilton were 15th and 16th in fp1 .
they came to the fore in fp1 , finishing first and second respectively .
hamilton was faster than rosberg in sectors one and two , but a lock-up in sector three cost him four tenths of a second .
sebastian vettel had problems throughout the day , and his car was clipped by sergio perez in fp2 , ripping off his front-wing endplate on the left side .