Lewis Hamilton admitted he was frustrated not to have achieved more from the Abu Dhabi Grand Prix after failing to make it into the top six on race day at the Yas Marina circuit.

The Briton had qualified fourth on the grid despite a spin in the latter part of qualifying, with the Mercedes team carrying out repairs overnight to allow him to take up his place on the grid - where further work was carried out on the brakes of his car prior to the start.

Although he maintained a top six place at the start, Hamilton's race was compromised in the second stint as he struggled for grip on the medium compound tyre and became stuck behind the Sauber of Esteban Gutierrez.

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It meant that while Nico Rosberg in the sister car was able to bring home a podium finish, Hamilton found himself battling in traffic for much of the evening as he came home more than 40 seconds down on his team-mate in seventh spot.

"That was a tough race this evening for me," he said. "My race just didn't quite come together and I'm not really sure why as I gave it my all out there. I had some problems with grip and, of course, it's so difficult to overtake here when you are in traffic but we also need to figure out why I'm not getting the maximum performance from the car at the moment.

"The guys worked so hard this weekend to get my car repaired and ready for the race so it's frustrating not to have delivered a better performance for them. A massive thank you to everyone for their efforts and it's great that we have extended our lead for P2 in the Constructors' Championship. All points count but Nico did a really good job today to maximise the potential of the car. Hopefully the last two races will be stronger for me and I look forward to that challenge."

Team boss Ross Brawn admitted that Hamilton's race had shown one of the current weaknesses with the Mercedes package which the team now needed to resolve in the final two races of the season.

"Lewis got tangled up in other people's races after his first stop and found it impossible to overtake in traffic," he said. "This is a clear weakness of our package at the moment and he spent most of his race behind slower cars, unable to demonstrate his true speed. T

"his is an issue where we need to get our thinking caps on in order to find a more effective compromise because there's little point having a quick car if we can't use that performance in the race. Even so, he still managed to collect valuable points with seventh place which further strengthened our championship position.

"We've had a good run in this sequence of races and we need to keep that going."