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Nico Rosberg has hauled Mercedes back to the top of the timesheets in second free practice for the Singapore Grand Prix, while Lewis Hamilton saw his session ended early by technical issues.

Having trailed Red Bull in FP1, Mercedes showed a stronger hand on the ultra-soft rubber in FP2, Rosberg stopping the clock at 1min 44.152s on the rapidly evolving circuit, putting him almost three tenths clear of second place Kimi Raikkonen in the Ferrari.

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However, it was a frustrating evening for championship leader Hamilton who, having struggled to get a clean lap on the ultra-soft tyres, was brought into the box with 20mins remaining for the team to investigate a hydraulics issue. Mercedes soon confirmed he would not make it back out on track, leaving him seventh on the timesheets with just 10 laps to his name in FP2.

Hampered by traffic on their fast runs, Max Verstappen and Daniel Ricciardo nonetheless lapped faster than FP1 in third and fourth - four tenths off the top spot -, the latter lucky to avoid calamity in the early stages when he spun but stayed out of the wall.

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Sebastian Vettel completed the top five, albeit more than a second behind Rosberg, with Nico Hulkenberg showing well for Force India in sixth, ahead of the hindered Hamilton.

Carlos Sainz and Daniil Kvyat completed a solid first day around the Marina Bay Circuit in eighth and tenth for Toro Rosso, the pair split by Fernando Alonso in the best of the McLarens, though the latter would end his session off course after stopping at turn 14 with a suspected gearbox problem.

With several drivers enduring off track moments as they find the limit of the tricky circuit - mostly at the first corner -, Romain Grosjean suffered most when he lost the rear of the Haas at the final corner and struck the barrier. With part of the wing lodged in the barrier, Grosjean nonetheless brought the car round to the pit lane but after technical issues in FP1, the Frenchman has completed just 14 laps all day.

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