Lewis Hamilton says he has no concerns about reliability after his fastest time in FP2 for the United States Grand Prix was overshadowed by technical issues on his Mercedes.

The championship leader topped both FP1 and FP2 around the Circuit of the Americas, despite losing track time in the latter stages of the second session when his car developed hydraulic issues.

Nonetheless, though technical gremlins have played their part in Mercedes' otherwise dominant 2014 F1 campaign for both Hamilton and arch rival Nico Rosberg, the British driver is confident issues won't occur again this weekend.

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"The car was feeling fine, we had to stop just in case," he said. "These are small glitches that happen. It is better to have it today and I am confident we won't have problems going forward but you don't know what lays ahead so we will take it as it comes.

"I don't feel concerned, it was just unfortunate to lose a little bit of a session, which was valuable in terms of understanding the long runs, the heavier fuel load and the tyres, but Nico got the data for the team so we should be OK."

Having ended the day a mere 0.003s ahead of Rosberg, Hamilton is expecting another competitive tussle between himself and his title rival this weekend.

"It looks close between me and Nico, so I am expecting a very tough battle. [The car] feels nice but we can improve it a little bit, which we will do this evening."