a small mistake from lewis hamilton allowed mercedes team mate nico rosberg to gain the upper hand in second practice for the bahrain grand prix to some extent the duo took it easy in fp1 as the team focused on a particular plan given the session was hardly representative of what all the drivers will face in qualifying and the race come the start, and with the track exceptionally dusty given its desert setting and which will naturally improve over the weekend with use, the circuit and air temperatures were a searing 52 and 36 degrees centigrade respectively nico rosberg (pictured) got the better of mercedes team mate lewis hamilton in bahrain second practice  rosberg was slower in sectors one and two of fp2 but a mistake from hamilton gifted him first place  hamilton (left) takes a corner in sakhir, bahrain ahead of ferrari driver sebastian vettel  come the start of fp2 at 6pm local time,when qualifying and the race commence under the hundreds of lights around the circuit, both temperatures had dropped considerably and that is when rosberg and hamilton came to the fore in fp1 pace was not their concern as the duo finished 15th and 16th, 1466secs and 1705secs adrift respectively of kimi raikkonen in his ferrari in fp2, and with the natural order restored as they finished first and second at the top of the timesheet, just 0115secs was the gap at the end of their runs on the soft pirelli tyre, the quicker of the two compounds this weekend that was due to a lock up from hamilton in the second sector of the bahrain international circuit which cost him four tenths of a second, otherwise he would likely have beaten rosberg by three tenths given he was faster in sectors one and two it allowed rosberg to lead the way with a lap of one minute 34647secs, with mercedes' nearest rivals again raikkonen and sebastian vettel, but half a second back vettel had his issues throughout the day, though, initially in fp1 as his car suffered a loss of power at one point, but with enough time in hand to ensure he returned to the circuit hamilton suffered a lock up in the second sector of the bahrain international circuit, leaving him in second  sparks fly from the rear end of hamilton's mercedes during a practice session in bahrain  in fp2, with nine minutes remaining, force india's sergio perez clipped vettel's car, ripping off the front wing endplate on the left side with debris on the track the session was red flagged, and with the stewards also announcing an investigation into the incident for causing a collision come the restart, raikkonen and hamilton took a wide berth in exiting the pit lane around a couple of cars that were slow away, far from impressing the stewards who are to also look at the duo's unnecessary manoeuvres behind the leading quartet came williams' valtteri bottas followed by daniel ricciardo in his red bull and lotus of pastor maldonado, all within a second of rosberg sauber's felipe nasr, daniil kvyat in his red bull and the williams of felipe massa completed the top 10, with the latter 1237secs off the pace sebastian vettel had issues throughout the day, eventually finishing the second practice in fourth place  vettel finished fourth, behind rosberg, hamilton and third placed kimi raikkonen in bahrain  mclaren's fernando alonso was 15secs back in 12th, whilst for team mate jenson button it was a day to forget in fp1 an electrical fault which cut the engine in the middle of turn one ended button's session after just three minutes, with the team unable to carry out a repair in fp2 the veteran was on his third lap when his car ground to a halt, although on this occasion his mechanics were able to send him back out button eventually completed 15 laps, finishing down in 19th place between manor duo will stevens, who finished 4484secs back, and team mate roberto merhi
the day fp2 nico rosberg lewis hamilton second 15th and 16th first sebastian vettel sergio perez hamilton rosberg
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 